ci: publish releases to Gitea instead of GitHub

The workflow was written for github.com: actions/upload-artifact failed on
the Gitea runner, softprops/action-gh-release only talks to the GitHub API,
and gen-manifest.js hardcoded github.com URLs.

- drop the artifact upload (release assets are the deliverable)
- upload release assets with tools/release-gitea.js, a dependency-free
  Gitea API client; re-running a tag replaces the attachments
- gen-manifest.js takes --server/PUBLIC_SERVER_URL and knows that Gitea
  spells the latest-asset URL /releases/download/latest/<file>
- PUBLIC_SERVER_URL is set explicitly because the runner only sees the
  instance's internal LAN address

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -7,6 +7,11 @@ on:
   pull_request:
   workflow_dispatch:
 
+env:
+  # Public URL of this Gitea instance. The runner is handed the instance's
+  # internal address (a LAN IP), which is no good in a manifest the TV fetches.
+  PUBLIC_SERVER_URL: https://git.crylia.de
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -30,28 +35,31 @@ jobs:
       - name: Generate manifest and repository index
         run: npm run manifest
 
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: lg-update-blocker
-          path: dist/*
+      - name: Show what was built
+        run: ls -la dist
 
       # Tag a commit with v<version> (matching package.json) to publish a
       # release. The repository URL for the Homebrew Channel stays stable:
-      # https://github.com/<owner>/<repo>/releases/latest/download/apps.json
+      # <server>/<owner>/<repo>/releases/download/latest/apps.json
+      - name: Write release notes
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: |
+          cat > "${RUNNER_TEMP:-/tmp}/release-notes.md" <<EOF
+          Install through the Homebrew Channel by adding this repository once
+          (Homebrew Channel → Settings → Add repository):
+
+          \`\`\`
+          ${PUBLIC_SERVER_URL}/${GITHUB_REPOSITORY}/releases/download/latest/apps.json
+          \`\`\`
+
+          That URL always resolves to the newest release, so future versions
+          show up as updates automatically.
+
+          Or install the \`.ipk\` below manually with \`ares-install <file>.ipk\`.
+          EOF
+
       - name: Release
         if: startsWith(github.ref, 'refs/tags/v')
-        uses: softprops/action-gh-release@v2
-        with:
-          files: dist/*
-          generate_release_notes: true
-          body: |
-            Install through the Homebrew Channel by adding this repository once
-            (Homebrew Channel → Settings → Add repository):
-
-            ```
-            https://github.com/${{ github.repository }}/releases/latest/download/apps.json
-            ```
-
-            Or install the `.ipk` below manually with
-            `ares-install <file>.ipk`.
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: node tools/release-gitea.js --notes-from "${RUNNER_TEMP:-/tmp}/release-notes.md"