Add self-hosting GitHub Pages workflow

Author: Jonathan D.A. Jewell

.github/workflows/pages.yml

@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@5e01c016a857a4dbb5afe9d0f9733cd472cba985 # v1
+        with:
+          deno-version: v1.x
+
+      - name: Cache Deno
+        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4
+        with:
+          path: ~/.cache/deno
+          key: ${{ runner.os }}-deno-${{ hashFiles('deno.json', 'deno.lock') }}
+
+      - name: Build site
+        run: |
+          mkdir -p site _site
+          if [ ! -f site/index.md ]; then
+            echo "---" > site/index.md
+            echo "title: $(basename $PWD)" >> site/index.md
+            echo "date: $(date +%Y-%m-%d)" >> site/index.md
+            echo "---" >> site/index.md
+            if [ -f README.adoc ]; then cat README.adoc >> site/index.md
+            elif [ -f README.md ]; then cat README.md >> site/index.md
+            else echo "# $(basename $PWD)" >> site/index.md; fi
+          fi
+          # Try common entry points
+          if [ -f mod.ts ]; then deno run -A mod.ts build site _site
+          elif [ -f main.ts ]; then deno run -A main.ts build site _site
+          elif [ -f src/main.ts ]; then deno run -A src/main.ts build site _site
+          elif [ -f mod.js ]; then deno run -A mod.js build site _site
+          elif [ -f main.js ]; then deno run -A main.js build site _site
+          else deno task build site _site || echo "No build command found"; fi
+
+      - name: Setup Pages
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3
+        with:
+          path: '_site'
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4