chore: edge Docker image now build & push after tests

.github/workflows/continuous_integration.yml

@@ -45,4 +45,21 @@ jobs:
       - name: Run tests
         run: |
           make tests-once
-          bash <(curl -s https://codecov.io/bash)
+          bash <(curl -s https://codecov.io/bash)
+
+  multiarch_build:
+    needs:
+      - Tests
+    name: Multi-arch build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Checkout source code
+        uses: actions/checkout@v4
+      - name: Build and push Docker image for main branch
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: |
+          make release GOTENBERG_VERSION=edge