add docs build workflow

.github/workflows/docs.yml

@@ -0,0 +1,55 @@
+name: Build and publish docs
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run
+# in-progress and latest queued.
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build docs.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python '3.10'
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+          cache: "pip"
+      - name: Install Tierkreis
+        run: pip install ."[typecheck]"
+      - name: Build docs
+        run: |
+          cd docs
+          ./build.sh
+      - name: Upload artifact.
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./docs/build/
+
+  publish:
+    name: Publish docs.
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+      - name: Deploy to GitHub Pages.
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -1,2 +1,4 @@
 ./venv
 tierkreis/core/protos/
+*.egg-info/
+**/__pycache__/