feat: add test setup with dex & oauth2-proxy

[perber]

No description provided.

[Copilot]

Pull request overview

This PR adds a local developer “proxy auth” stack (Dex + oauth2-proxy) to exercise LeafWiki’s --enable-http-remote-user mode, including a variant that demonstrates proper logout behavior, and introduces a .dockerignore to slim Docker build contexts.

Changes:

• Add two Docker Compose variants to run LeafWiki behind oauth2-proxy + Dex (with and without a configured logout URL).
• Add a helper run.sh script to start/stop the stacks.
• Add a .dockerignore to reduce Docker build context size (excluding e2e tooling, hacks, etc.).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
hacks/proxy-auth/with-logout.yml	Compose stack wiring Dex + oauth2-proxy + LeafWiki with LeafWiki logout redirected to oauth2-proxy signout.
hacks/proxy-auth/without-logout.yml	Same stack without LeafWiki logout redirect, to reproduce “can’t really log out” behavior.
hacks/proxy-auth/run.sh	Convenience script to bring stacks up/down.
hacks/proxy-auth/dex/config.yaml	Dex in-memory OIDC config + a static dev user/client for local testing.
.dockerignore	Excludes non-build inputs (e2e, hacks, docs, etc.) from Docker build context.

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