Add CI and release workflows

.gitea/workflows/release.yml

@@ -0,0 +1,37 @@
+name: Release
+
+# Push a tag such as v0.2.0 to publish public/ as a release archive that can be
+# unpacked into SANDBAR_APP_DIR or hosted on any static site:
+#   git tag -a v0.2.0 -m "remora v0.2.0" && git push origin v0.2.0
+on:
+  push:
+    tags: ['v*']
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # release notes come from the history since the previous tag
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Test
+        run: npm test
+
+      - name: Build release archive
+        run: |
+          mkdir -p dist
+          tar -C public -czf "dist/remora_${GITHUB_REF_NAME}.tar.gz" .
+          (cd public && zip -qr "../dist/remora_${GITHUB_REF_NAME}.zip" .)
+          (cd dist && sha256sum remora_* > SHA256SUMS)
+
+      # Optional secret RELEASE_TOKEN: an access token that can write releases, for
+      # servers where the automatic job token can't.
+      - name: Publish the release
+        env:
+          TOKEN: ${{ secrets.RELEASE_TOKEN || secrets.GITHUB_TOKEN }}
+        run: sh deploy/publish-release.sh "${GITHUB_REF_NAME}"