Add HTML building action (#271)

* Add HTML building action

* Update .github/workflows/html-build.yml

Co-authored-by: Victor Lomuller <victor@codeplay.com>

---------

Co-authored-by: Victor Lomuller <victor@codeplay.com>

.github/workflows/html-build.yml

@@ -0,0 +1,33 @@
+name: Rebuild all with asciidoctor
+
+on:
+  # Runs on pushes targeting the main branch.
+  push:
+    branches: ["main"]
+  # Runs on pull requests, uses the action's description from the target branch.
+  pull_request_target:
+    types: [opened,synchronize]
+
+  workflow_dispatch:
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    # We now refer to the container by its SHA instead of the name, to prevent
+    # caching problems when updating the image.
+    # container: khronosgroup/docker-images:asciidoctor-spec.20240726
+    container: khronosgroup/docker-images@sha256:089687083ceb36483a3917389e4278718ab19c594099634f5dd80e22540c960f
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Build AsciiDoctor
+        run: |
+          find . -name "*.asciidoc" -exec touch {} \;
+          make all
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: HTML
+          path: ${{github.workspace}}/**/*.html