Reworks the pipeline so a change is built once and a release is driven by the
merge, not a manual tag push.
- ci.yaml now runs on pull_request (one gate per PR) instead of every branch
push, so there's no CI-on-push + CI-on-merge double run. A single `ci` job
with a docs-only fast-path keeps the required "CI" check always reporting
(docs/metadata-only PRs skip the Android build but still go green).
- release.yaml triggers on push to main. A cheap `detect` job reads versionName
from build.gradle; only when no tag for it exists does the `release` job run:
tests on the merged commit, build + sign, publish to F-Droid, then create the
vX.Y.Z tag + Gitea release via the API (target_commitish = the merged sha).
The tag is now an OUTPUT of a successful release, not its trigger — a failure
before publish leaves no tag, so re-running safely retries. No more separate
tag-triggered run or duplicate ci job.
- The committed versionName/versionCode are now the source of truth (pipeline
pins versionCode from versionName); updated the build.gradle comment.
- translations.yaml switched to pull_request (same path filter).
- docs/RELEASING.md: release-by-merge flow, no manual git tag.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>