anchor.diff:  # Install coverage tool:
   RUN go install knative.dev/test-infra/tools/coverage
   # This runs "runner.sh coverage" so coverage can be used with any installed Go
  -# TODO: Prow jobs run `runner.sh coverage` instead `/coverage`
  -COPY images/prow-tests/coverage.sh /coverage
   
   # Install kntest
   RUN go install knative.dev/test-infra/kntest/cmd/kntest
  
positive.code: # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # This is the base Dockerfile for knative-tests images, please remember to also
  # do `make push` in `../prow-tests-*` directories to make sure these images are in
  # sync
  
  # TODO(chizhg): probably build the image from scratch?
  FROM gcr.io/k8s-testimages/kubekins-e2e:v20200326-e946722-master
  
  # Install extras on top of base image
  
  
negative.code: RUN docker-credential-gcr configure-docker
  
  # Replace kubectl with a working version
  # TODO(chizhg): remove once https://github.com/knative/test-infra/issues/1858 is fixed in releases <= 0.15 or those releases are no longer supported
  ARG KUBECTL_VERSION=v1.17.4
  RUN rm -f "$(which kubectl)" && \
      wget "https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" -O /usr/local/bin/kubectl && \
  