fix: Modernize READMEs

[nurof3n]

Signed-off-by: Alex-Andrei Cioc andrei.cioc@unikraft.io

Closes https://linear.app/unikraft/issue/FIELD-317/docs-clarify-buildkit-deps
Closes https://linear.app/unikraft/issue/FIELD-348/examples-do-a-pass-through-to-modernize-all-of-them

[danielvallance]

Also requesting a review from Copilot as it is a lot to read

[Copilot]

Pull request overview

This PR modernizes the repository’s example READMEs and deployment metadata to align with current Unikraft CLI/kraft usage, clarify BuildKit requirements, and update scale-to-zero guidance across examples.

Changes:

• Update many READMEs with standardized “Install the CLI + BuildKit builder” prerequisites and refreshed deploy/run commands and sample outputs.
• Remove scale-to-zero-related labels: (and some name: fields) from numerous Kraftfiles, shifting scale-to-zero configuration into CLI flags in docs/workflows.
• Add a Redis 7.2 example rootfs configuration (Dockerfile + redis.conf + Kraftfile) and update select CI workflows’ scale-to-zero settings.

Reviewed changes

Copilot reviewed 158 out of 160 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
wordpress-compose/README.md	Update prerequisites to include BuildKit and new CLI docs links.
wordpress-all-in-one/README.md	Refresh deploy/run commands, scale-to-zero flags, and sample outputs; add instance list/delete section.
wordpress-all-in-one/Kraftfile	Remove name and scale-to-zero labels.
wazero-import-go/README.md	Update prerequisites, deploy commands, and sample outputs; add instance list output.
wazero-import-go/Kraftfile	Remove scale-to-zero labels.
tyk/README.md	Update prerequisites; remove lengthy compose output example.
tyk/Kraftfile	Remove scale-to-zero labels.
traefik/Kraftfile	Remove scale-to-zero labels.
spin-wagi-http/Kraftfile	Remove scale-to-zero labels.
skipper0.18/README.md	Update prerequisites, deploy commands, and sample outputs.
skipper0.18/Kraftfile	Remove scale-to-zero labels.
ruby3.2-rails/Kraftfile	Remove scale-to-zero labels.
redis7.2/fs/etc/redis/redis.conf	Add Redis configuration for the new Redis 7.2 example.
redis7.2/Kraftfile	Add Kraftfile for Redis 7.2 example (rootfs + cmd).
redis7.2/Dockerfile	Add minimal scratch-based rootfs build for Redis 7.2.
python-playwright-chromium/Kraftfile	Remove scale-to-zero labels.
postgres/README.md	Update prerequisites and sample outputs; adjust memory units in kraft commands.
postgres/Kraftfile	Remove name and scale-to-zero labels.
opentelemetry-collector/README.md	Update prerequisites, deploy commands, and outputs; document service behavior.
opentelemetry-collector/Kraftfile	Remove scale-to-zero labels.
novnc-browser/README.md	Update prerequisites, memory unit, and sample outputs.
node24-karaoke/README.md	Update prerequisites, deploy commands, and sample outputs.
node24-karaoke/Kraftfile	Remove scale-to-zero labels.
node21-websocket/Kraftfile	Remove scale-to-zero labels.
node18-wingsio/Kraftfile	Remove name and scale-to-zero labels.
node18-agario/Kraftfile	Remove name and scale-to-zero labels.
node-playwright-webkit/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12-FastAPI-0.121.3/.gitignore	Remove ignore rules (file deleted).
httpserver-python3.12-FastAPI-0.121.3/.dockerignore	Remove ignore rules (file deleted).
httpserver-prisma-expressjs4.19-node18/Kraftfile	Remove name and scale-to-zero labels.
httpserver-php8.2/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-php8.2/Kraftfile	Remove scale-to-zero labels.
httpserver-perl5.42/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-perl5.42/Kraftfile	Normalize file and remove scale-to-zero labels while keeping cmd/rootfs.
httpserver-node25/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-node25/Kraftfile	Remove scale-to-zero labels.
httpserver-node21-sveltekit/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-node21-sveltekit/Kraftfile	Remove scale-to-zero labels.
httpserver-node21-solid-start/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-node21-solid-start/Kraftfile	Remove scale-to-zero labels.
httpserver-node21-remix/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-node21-remix/Kraftfile	Remove scale-to-zero labels.
httpserver-node21-nextjs/Kraftfile	Remove scale-to-zero labels.
httpserver-node-vite-vanilla/Kraftfile	Remove name and scale-to-zero labels.
httpserver-node-vite-ssr-vanilla/Kraftfile	Remove name and scale-to-zero labels.
httpserver-node-express-puppeteer/Kraftfile	Remove scale-to-zero labels.
httpserver-nginx-vite-vanilla/Kraftfile	Remove name and scale-to-zero labels.
httpserver-lua5.1/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-lua5.1/Kraftfile	Remove scale-to-zero labels.
httpserver-java21/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-java21/Kraftfile	Remove scale-to-zero labels and stale comment.
httpserver-java17-springboot3.5.x/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-java17-springboot3.5.x/Kraftfile	Remove scale-to-zero labels.
httpserver-java17-spring-petclinic/Kraftfile	Remove scale-to-zero labels.
httpserver-gpp13.2/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-gpp13.2/Kraftfile	Remove scale-to-zero labels.
httpserver-go1.22-redis/README.md	Update prerequisites to include BuildKit and new CLI docs links.
httpserver-go1.22-redis/Kraftfile	Remove scale-to-zero labels.
httpserver-go1.21/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-go1.21/Kraftfile	Remove scale-to-zero labels.
httpserver-gcc13.2/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-gcc13.2/Kraftfile	Remove scale-to-zero labels.
httpserver-flask-redis/README.md	Update prerequisites to include BuildKit and new CLI docs links.
httpserver-flask-redis/Kraftfile	Remove scale-to-zero labels.
httpserver-expressjs4.18-node21/Kraftfile	Remove scale-to-zero labels.
httpserver-erlang26.2/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-erlang26.2/Kraftfile	Remove scale-to-zero labels.
httpserver-elixir1.16/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-elixir1.16/Kraftfile	Remove name and scale-to-zero labels.
httpserver-dotnet10.0/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-dotnet10.0/Kraftfile	Remove scale-to-zero labels.
httpserver-c-debug/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-c-debug/Kraftfile	Remove scale-to-zero labels.
httpserver-bun/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-bun/Kraftfile	Remove scale-to-zero labels.
httpserver-boost1.74-gpp13.2/Kraftfile	Remove scale-to-zero labels.
haproxy/README.md	Update prerequisites, deploy commands, and sample outputs.
haproxy/Kraftfile	Remove scale-to-zero labels.
grafana/README.md	Update prerequisites, deploy commands, and sample outputs.
grafana/Kraftfile	Remove scale-to-zero labels.
github-webhook-node/Kraftfile	Remove scale-to-zero labels.
duckdb-go1.21/README.md	Update prerequisites, deploy commands, and sample outputs.
duckdb-go1.21/Kraftfile	Remove scale-to-zero labels.
dragonflydb/README.md	Fix wording/grammar; update prerequisites, deploy commands, and sample outputs.
dragonflydb/Kraftfile	Remove scale-to-zero labels.
debian-ssh/README.md	Update prerequisites, deploy commands, and sample outputs.
debian-ssh/Kraftfile	Remove scale-to-zero labels.
chromium-cdp/README.md	Update prerequisites and sample outputs; add metro comment line.
caddy2.7-go1.21/README.md	Update prerequisites, deploy commands, and sample outputs.
caddy2.7-go1.21/Kraftfile	Remove scale-to-zero labels.
.github/workflows/example-visual-studio-code-server-staging.yaml	Reduce scale-to-zero cooldown value.
.github/workflows/example-visual-studio-code-server-stable.yaml	Reduce scale-to-zero cooldown value.
.github/workflows/example-grafana-stable.yaml	Switch scale-to-zero policy to idle and reduce cooldown.
mcp-server-simple/README.md	Update prerequisites, deploy commands, and sample outputs.
mcp-server-simple/Kraftfile	Remove name and scale-to-zero labels.
mcp-server-arxiv/Kraftfile	Remove scale-to-zero labels.
mariadb/Kraftfile	Remove scale-to-zero labels.
imaginary/README.md	Update prerequisites, deploy commands, and sample outputs.
imaginary/Kraftfile	Remove scale-to-zero labels.
hugo0.122/README.md	Update prerequisites, deploy commands, and sample outputs.
hugo0.122/Kraftfile	Remove scale-to-zero labels.
httpserver-rust1.91/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-rust1.91/Kraftfile	Remove scale-to-zero labels.
httpserver-rust1.87-actix-web4/Kraftfile	Remove scale-to-zero labels.
httpserver-rust1.81-rocket0.5/Kraftfile	Remove scale-to-zero labels.
httpserver-rust1.75-tokio/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-rust1.75-tokio/Kraftfile	Remove scale-to-zero labels.
httpserver-rust-trunkrs-leptos/Kraftfile	Remove scale-to-zero labels.
httpserver-ruby3.2/README.md	Update prerequisites, deploy commands, and sample outputs.
httpserver-ruby3.2/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12-flask3.0/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12-flask3.0-sqlite/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12-fastapi-0.121.3/Kraftfile	Remove scale-to-zero labels.
httpserver-python3.12-django5.0/Kraftfile	Remove scale-to-zero labels.
memcached1.6/README.md	Update prerequisites, deploy commands, and sample outputs.
memcached1.6/Kraftfile	Remove scale-to-zero labels.
minio/README.md	Update prerequisites, deploy commands, and sample outputs.
minio/Kraftfile	Remove scale-to-zero labels.
mongodb/Kraftfile	Remove scale-to-zero labels.
nginx/README.md	Update prerequisites, deploy commands, and sample outputs.
nginx/Kraftfile	Remove scale-to-zero labels.

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Pull request overview

Copilot reviewed 158 out of 160 changed files in this pull request and generated 7 comments.

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Pull request overview

Copilot reviewed 158 out of 160 changed files in this pull request and generated no new comments.

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[dragosgheorghioiu]

LGTM!

Reviewed-by: Dragos Gheorghioiu dragosg@unikraft.com
Approved-by: Dragos Gheorghioiu dragosg@unikraft.com