Add a GitHub workflow to autogenerate the register docs.

.github/workflows/doc-gen.yml

@@ -0,0 +1,63 @@
+# docs: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+
+name: Build Register Documentation
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: ["main"]
+
+jobs:
+  build:
+    name: Build
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install peakrd-uvm
+        run: |
+          python3 -m pip install \
+              peakrdl-uvm==2.2.0 \
+              peakrdl-regblock==0.10.0 \
+              peakrdl-html==2.9.0 \
+              peakrdl-ipxact==3.3.0
+
+      - name: Generate docs
+        run: |
+          echo Running script
+          tools/scripts/reg_doc_gen.sh
+
+      - name: Stage documents
+        run: |
+          mkdir -p /tmp/pages-docs/0.8
+          cp -R src/integration/docs/caliptra_reg_html /tmp/pages-docs/0.8/internal-regs
+          cp -R src/soc_ifc/docs/caliptra_top_reg_html /tmp/pages-docs/0.8/external-regs
+          find /tmp/pages-docs
+
+      - name: Generate GitHub Pages artifacts
+        uses: actions/upload-pages-artifact@v1
+        with:
+          path: /tmp/pages-docs
+
+  deploy:
+    name: Deploy
+    needs: build
+    if: github.event_name == 'push'
+
+    permissions:
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1