chore: publish client to firebase hosting automatically

.github/workflows/build.yml

@@ -19,6 +19,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          # Need full history to determine version number.
+          fetch-depth: 0
       - uses: actions/setup-node@v4
         with:
           node-version: 20.x
@@ -34,7 +37,10 @@ jobs:
       - name: Typecheck with TypeScript
         run: npm run typecheck
       - name: Build client bundles
-        run: npm run build -- --no-typecheck --no-lint
+        run: |
+          build_info="{'tag':'$(git describe --always --tags)', 'url':'https://github.com/google/neuroglancer/commit/$(git rev-parse HEAD)', 'timestamp':'$(date)'}"
+          npm run build -- --no-typecheck --no-lint --define NEUROGLANCER_BUILD_INFO="${build_info}"
+        shell: bash
       - name: Build Python client bundles
         run: npm run build-python -- --no-typecheck --no-lint
       - run: npm run build-package
@@ -51,6 +57,12 @@ jobs:
           name: npm-package
           path: dist/package
         if: ${{ runner.os == 'Linux' }}
+      - name: Upload client as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: client
+          path: dist/client
+        if: ${{ runner.os == 'Linux' }}
 
   # Builds Python package and runs Python tests
   #
@@ -183,6 +195,10 @@ jobs:
         with:
           name: npm-package
           path: npm-package
+      - uses: actions/download-artifact@v4
+        with:
+          name: client
+          path: dist/client
       # - name: Publish to PyPI (test server)
       #   uses: pypa/gh-action-pypi-publish@54b39fb9371c0b3a6f9f14bb8a67394defc7a806 # 2020-09-25
       #   with:
@@ -201,6 +217,13 @@ jobs:
       #   working-directory: npm-package
       #   env:
       #     NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+      - name: Publish to Firebase hosting
+        uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          firebaseServiceAccount: "${{ secrets.FIREBASE_HOSTING_SERVICE_ACCOUNT_KEY }}"
+          projectId: neuroglancer-demo
+        if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+
   ngauth:
     strategy:
       matrix: