Merge pull request knative#253 from openshift-cherrypick-robot/cherry…

…-pick-251-to-release-v1.8

[release-v1.8] Delete the created golang cache directory during docker build

openshift/ci-operator/build-image/Dockerfile

@@ -10,5 +10,9 @@ RUN yum install -y kubectl httpd-tools
 RUN GOFLAGS='' go install github.com/mikefarah/yq/v3@latest
 RUN GOFLAGS='' go install knative.dev/test-infra/tools/kntest/cmd/kntest@latest
 
+# go install creates $GOPATH/.cache with root permissions, we delete it here
+# to avoid permission issues with the runtime users
+RUN rm -rf $GOPATH/.cache
+
 # Allow runtime users to add entries to /etc/passwd
 RUN chmod g+rw /etc/passwd