Add GitHub Actions to deploy to GitHub Pages

Moving off Netlify to simplify infrastructure

Author: doismellburning

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build and Deploy
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - run: make build
+      - uses: actions/upload-pages-artifact@v3
+        id: upload-artifact
+        with:
+          path: "_site/"
+
+  deploy:
+    if: github.ref == 'refs/heads/main' || github.event_name == 'workflow_dispatch'
+    environment:
+      name: github-pages
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    steps:
+      - uses: actions/deploy-pages@v4