Use lockfile-based installs and document alternative base image for Docker

[singhvishalkr]

Improves the Docker installation documentation with two changes:

Reproducible installs:

• Development Dockerfiles: yarn install --frozen-lockfile / npm ci instead of plain yarn install / npm install
• Production Dockerfiles: same lockfile flags for consistency
• Ensures container builds are deterministic and match the lockfile exactly

Alternative base image note:

• Added a tip about using node:22-slim (Debian-based) instead of node:22-alpine for environments with restricted network access
• Sharp's prebuilt binaries work out of the box on Debian, avoiding the need to compile libvips from source
• Addresses the DNS/network issues reported in [Bug]: General improvements to the example dockerfile #2577

Closes #2577

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Apr 11, 2026 2:52pm

[pwizla]

Thank you for your initiative again, and thank you for your attention to details, @singhvishalkr

I also fixed the PR title for you on this one.

The PR is now approved, merged, should be live on docs.strapi.io in a few minutes, and will be mentioned in the next weekly snapshot release.