feat(push-to-gar-docker): parse registry as input in login-to-gar (#1492)

Parse registry as input in login-to-gar

Author: dsotirakis

actions/push-to-gar-docker/action.yaml

@@ -164,6 +164,7 @@ runs:
       with:
         environment: ${{ inputs.environment }}
         delete_credentials_file: false
+        registry: ${{ inputs.registry }}
     - name: Extract metadata (tags, labels) for Docker
       id: meta
       uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0