🔧 Prevent error 429 downloading docker images from dockerhub

.github/workflows/build-docker.yml

@@ -66,6 +66,15 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      # To avoid the “429 Too Many Requests” error when downloading
+      # images from DockerHub for unregistered users.
+      # https://docs.docker.com/docker-hub/usage/
+      - name: Login to DockerHub Registry
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.PUB_DOCKER_USERNAME }}
+          password: ${{ secrets.PUB_DOCKER_PASSWORD }}
+
       - name: Extract metadata (tags, labels)
         id: meta
         uses: docker/metadata-action@v5