fix: Added missing requirements for GitHub build action

Author: Vicente Herrera

.github/workflows/build-installer.yaml

@@ -127,6 +127,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Login to DockerHub
         uses: docker/login-action@v1 
         with: