ci: auto-comment the pr-XXX image tag on PRs and linked issues

[amir20]

After the per-PR image is pushed, post a sticky comment on the PR with
the docker run command, and a one-time comment on each issue the PR
closes so reporters can test without waiting for a release.

Co-Authored-By: Claude Opus 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_016m2chBwXvH2ud1GFpejRh8

[claude]

Reviewed .github/workflows/dev.yml. Overall solid: env-var interpolation (no shell injection), idempotent via HTML markers, and fork PRs are safely excluded transitively through needs: buildx.

A couple of things worth checking:

• The closing-keyword regex (grep -oiE '(close[sd]?|fix(e[sd])?|resolve[sd]?)...#[0-9]+') only matches shorthand #123. A PR body using Fixes https://github.com/amir20/dozzle/issues/123 won't get picked up, so no issue comment in that case.
• The sticky PR comment (pr_marker) is posted/updated on every push regardless of draft status; only the linked-issue comments are gated by IS_DRAFT. Probably fine, just confirm that's intended (build/push already happens for drafts today, so no new cost here).
• if [ "$issue" = "$PR" ] is dead code since a PR and an issue in the same repo can't share a number — harmless, could drop.

[github-actions]

Try this PR without waiting for a release:

docker run -v /var/run/docker.sock:/var/run/docker.sock -p 8080:8080 amir20/dozzle:pr-5013

Also on ghcr.io/amir20/dozzle:pr-5013 and as amir20/dozzle:pr-5013-alpine. Rebuilt on every push, currently caabcc6.