ci: port breadbar onto shared bread-ecosystem build system

Delegates dev/rc/release build steps to bread-ecosystem's pinned Arch
container via ci/build.sh, pinned to bread-ecosystem commit
147cfbbf96ae4b171027defa1130d2caddb934b1. Adds a check.yml workflow
for fast clippy/test signal on feature/fix branches, matching the
pattern proven in breadpad. No ci/deps.txt needed — breadbar's
dependencies (zbus, resvg, gtk4-layer-shell, hyprland) are all pure
Rust or already covered by the shared image's package set.

.forgejo/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
             "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
 
       - name: build
-        run: cd src && cargo build --release --locked
+        run: cd src && bash ci/build.sh cargo build --release --locked
 
       - name: prepare artifacts
         run: |