feat(ci): stamp build metadata and validate footer version hash

.gitea/workflows/ci.yml

@@ -84,6 +84,12 @@ jobs:
       - name: Install dependencies
         run: bun install --frozen-lockfile
 
+      - name: Resolve build metadata
+        run: |
+          version=$(bun -e 'const pkg = JSON.parse(await Bun.file("package.json").text()); console.log(pkg.version)')
+          echo "NEXT_PUBLIC_APP_VERSION=$version" >> "$GITHUB_ENV"
+          echo "NEXT_PUBLIC_GIT_SHA=${GITHUB_SHA}" >> "$GITHUB_ENV"
+
       - name: Install Playwright browser deps
         run: bunx playwright install --with-deps chromium