ci: Add workflow for automated release PRs

.github/workflows/release.yaml

@@ -0,0 +1,53 @@
+on:
+  push:
+    branches:
+      - master
+      - v[0-9]*
+
+name: Release
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+    steps:
+      # Create/update release PR
+      - uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          # Required input to specify the release type (node package).
+          release-type: node
+          # Make sure the player version gets updated.
+          extra-files: lib/player.js
+          # Make sure we create the PR against the correct branch.
+          default-branch: ${{ github.ref_name }}
+
+  # The jobs below are all conditional on a release having been created by
+  # someone merging the release PR.  They all run in parallel.
+
+  npm:
+    runs-on: ubuntu-latest
+    needs: release
+    if: ${{ needs.release.outputs.release_created }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: 'https://registry.npmjs.org'
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+      - run: npm pack
+      - uses: svenstaro/upload-release-action@483c1e56f95e88835747b1c7c60581215016cbf2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ needs.release.outputs.tag_name }}
+          file: shaka-player-*.tgz
+          file_glob: true
+          overwrite: true
+
+  # TODO: Publish to appspot

lib/player.js

@@ -6102,7 +6102,7 @@ shaka.Player.TYPICAL_BUFFERING_THRESHOLD_ = 0.5;
  * @define {string} A version number taken from git at compile time.
  * @export
  */
-shaka.Player.version = 'v3.1.5-uncompiled';
+shaka.Player.version = 'v3.1.5-uncompiled';  // x-release-please-version
 
 // Initialize the deprecation system using the version string we just set
 // on the player.