Enable auto-publication

.github/workflows/auto-publish.yml

@@ -0,0 +1,32 @@
+name: Automatic publication
+on:
+  # Worflow runs on pull requests where it makes sure that the spec can be
+  # generated, that markup and IDL are valid, as well as on pushes to the
+  # default branch where it also deploys the generated spec to the gh-pages
+  # branch and publishes the result to /TR.
+  # The "workflow_dispatch" hook allows repo admins to trigger the workflow
+  # manually if needed.
+  pull_request: {}
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  main:
+    name: Build, validate and deploy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build, validate and deploy spec
+        uses: w3c/spec-prod@v2
+        with:
+          TOOLCHAIN: respec
+          SOURCE: index.html
+          DESTINATION: index.html
+          GH_PAGES_BRANCH: gh-pages
+          W3C_ECHIDNA_TOKEN: ${{ secrets.ECHIDNA_TOKEN }}
+          W3C_WG_DECISION_URL: https://github.com/w3c/media-wg/issues/27
+          W3C_BUILD_OVERRIDE: |
+            specStatus: DRY