Add GitHub Action to Publish Web Version (#4)

Add a new GitHub Action to publish the web version of FeedDeck to
Cloudflare Pages. The action will build and publish the web version to
the stage project on every commit to the main branch and to the prod
project when a new tag is created.

.github/workflows/continuous-delivery.yaml

@@ -52,3 +52,70 @@ jobs:
           file: ./supabase/functions/_cmd/Dockerfile
           platforms: linux/amd64,linux/arm64/v8
           tags: ghcr.io/${{ github.repository_owner }}/feeddeck:${{ env.TAG }}
+
+  web:
+    name: Web
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: "app"
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Install Packages
+        run: |
+          # Required for Flutter
+          sudo apt-get update -y
+          sudo apt-get install -y ninja-build libgtk-3-dev
+
+      - name: Set Environment Variables
+        id: tag
+        run: |
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            echo CLOUDFLARE_PROJECT_NAME=${{ secrets.CLOUDFLARE_PROJECT_NAME_PROD }} >> $GITHUB_ENV
+
+            echo SUPABASE_URL=${{ secrets.SUPABASE_PROD_URL }} >> $GITHUB_ENV
+            echo SUPABASE_ANON_KEY=${{ secrets.SUPABASE_PROD_ANON_KEY }} >> $GITHUB_ENV
+            echo SUPABASE_SITE_URL=${{ secrets.SUPABASE_PROD_SITE_URL }} >> $GITHUB_ENV
+            echo GOOGLE_CLIENT_ID=${{ secrets.SUPABASE_PROD_GOOGLE_CLIENT_ID }} >> $GITHUB_ENV
+          else
+            echo CLOUDFLARE_PROJECT_NAME=${{ secrets.CLOUDFLARE_PROJECT_NAME_STAGE }} >> $GITHUB_ENV
+
+            echo SUPABASE_URL=${{ secrets.SUPABASE_STAGE_URL }} >> $GITHUB_ENV
+            echo SUPABASE_ANON_KEY=${{ secrets.SUPABASE_STAGE_ANON_KEY }} >> $GITHUB_ENV
+            echo SUPABASE_SITE_URL=${{ secrets.SUPABASE_STAGE_SITE_URL }} >> $GITHUB_ENV
+            echo GOOGLE_CLIENT_ID=${{ secrets.SUPABASE_STAGE_GOOGLE_CLIENT_ID }} >> $GITHUB_ENV
+          fi
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.7.12'
+          channel: 'stable'
+          cache: true
+          cache-key: 'flutter-:os:-:channel:-:version:-:arch:-:hash:'
+          cache-path: '${{ runner.tool_cache }}/flutter/:channel:-:version:-:arch:'
+
+      - name: Install Dependencies
+        run: |
+          flutter pub get
+
+      - name: Build
+        run: |
+          flutter config --enable-web
+          flutter build web --release --dart-define SUPABASE_URL=${{ env.SUPABASE_URL }} --dart-define SUPABASE_ANON_KEY=${{ env.SUPABASE_ANON_KEY }} --dart-define SUPABASE_SITE_URL=${{ env.SUPABASE_SITE_URL }} --dart-define GOOGLE_CLIENT_ID=${{ env.GOOGLE_CLIENT_ID }}
+
+      - name: Publish to Cloudflare Pages
+        uses: cloudflare/pages-action@v1
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          projectName: ${{ env.CLOUDFLARE_PROJECT_NAME }}
+          directory: ./app/build/web
+          branch: main