feat: complete saleor core extensions app with React email templates

- Order confirmation, shipped, and cancelled email templates
- Uses @react-email/components for professional HTML emails
- Sends admin and customer notifications
- Integrates with Resend for email delivery
- Webhook handlers for ORDER_CREATED, ORDER_FULFILLED, ORDER_CANCELLED
- Docker image optimized for production
- Persistent auth data storage via PVC

.github/workflows/main.yml

@@ -0,0 +1,29 @@
+name: QA
+on: [pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup PNPM
+        uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
+        with:
+          run_install: false
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: ".nvmrc"
+          cache: "pnpm"
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Lint
+        run: pnpm lint
+      - name: Check types
+        run: pnpm check-types
+      - name: Check for changes in generated files
+        run: |
+          pnpm generate
+          git diff --name-status --exit-code .
+      - name: Test
+        run: pnpm test
+      - name: Build project
+        run: pnpm build