Migrate from Netlify to Firebase

.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "beeware-org"
+  }
+}

.github/workflows/ci.yml

@@ -3,8 +3,8 @@ on:
   pull_request:
 
 jobs:
-  build:
-    name: Build site
+  build_and_preview:
+    if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
@@ -20,4 +20,12 @@ jobs:
       - name: Build site
         run: |
           lektor plugins reinstall
-        lektor build --no-prune
+          lektor build --no-prune -O output
+
+      # Generated from 'firebase init hosting'
+      - uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: '${{ secrets.GITHUB_TOKEN }}'
+          firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_BEEWARE_ORG }}'
+          projectId: beeware-org
+

firebase.json

@@ -0,0 +1,10 @@
+{
+  "hosting": {
+    "public": "output",
+    "ignore": [
+      "firebase.json",
+      "**/.*",
+      "**/node_modules/**"
+    ]
+  }
+}