Upload Docker images to AWS ECR Public (#230)

Author: lucacome

.github/workflows/ci.yml

@@ -76,13 +76,21 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
         if: github.event_name != 'pull_request'
+      - name: Login to Public ECR
+        uses: docker/login-action@v1
+        with:
+          registry: public.ecr.aws
+          username: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          password: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        if: github.event_name != 'pull_request'
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v3
         with:
           images: |
             nginx/nginx-prometheus-exporter
             ghcr.io/nginxinc/nginx-prometheus-exporter
+            public.ecr.aws/nginx/nginx-prometheus-exporter
           tags: |
             type=edge
             type=ref,event=pr