gha: add ECR as registry to push images to

Author: ivotron

.github/workflows/docker-image.yml

@@ -37,6 +37,7 @@ jobs:
           # list of Docker images to use as base name for tags
           images: |
             redpandadata/kminion
+            public.ecr.aws/l9j0i2e0/kminion
           # generate Docker tags based on the following events/attributes
           # Semver type is only active on 'push tag' events,
           # hence no enable condition required
@@ -47,6 +48,10 @@ jobs:
         with:
           username: ${{ env.DOCKERHUB_USER }}
           password: ${{ env.DOCKERHUB_TOKEN }}
+      - name: login to amazon ECR Public
+        uses: aws-actions/amazon-ecr-login@v2
+        with:
+          registry-type: public
       - uses: docker/build-push-action@v6
         with:
           provenance: false