fix: delete ACR image after successful tests

Author: andhrelja

.github/workflows/k8s_test.yml

@@ -122,4 +122,4 @@ jobs:
           inlineScript: |
             az acr repository delete \
               --name ${{ env.AZURE_CONTAINER_REGISTRY }} \
-              --image ${{ env.AZURE_CONTAINER_REGISTRY }}/${{ github.event.repository.name }}:test-${{ github.head_ref }}
+              --image ${{ github.event.repository.name }}:test-${{ github.head_ref }}