test: fix util image (#869)

openshift/ci-operator/knative-images/func-util/Dockerfile

@@ -1,5 +1,5 @@
 # DO NOT EDIT! Generated Dockerfile for cmd/func-util.
-ARG GO_BUILDER=registry.ci.openshift.org/openshift/release:rhel-9-release-golang-1.22-openshift-4.17
+ARG GO_BUILDER=registry.ci.openshift.org/openshift/release:rhel-8-release-golang-1.22-openshift-4.17
 ARG GO_RUNTIME=registry.access.redhat.com/ubi8/ubi-minimal
 
 FROM $GO_BUILDER as builder
@@ -9,22 +9,22 @@ COPY . .
 ENV CGO_ENABLED=1
 ENV GOEXPERIMENT=strictfipsruntime
 
-RUN go build -tags strictfipsruntime -o /usr/bin/main ./cmd/func-util
+RUN GOFLAGS='' go build -tags strictfipsruntime,exclude_graphdriver_btrfs -o /usr/bin/main ./cmd/func-util
 
 FROM $GO_RUNTIME
 
 ARG VERSION=knative-nightly
 
 RUN microdnf install tzdata socat tar
 
-USER 65532
-
 COPY --from=builder /usr/bin/main /usr/bin/func-util
 
 RUN ln -s /usr/bin/func-util /usr/local/bin/deploy && \
 	ln -s /usr/bin/func-util /usr/local/bin/scaffold && \
 	ln -s /usr/bin/func-util /usr/local/bin/s2i
 
+USER 65532
+
 LABEL \
       com.redhat.component="openshift-serverless-1-kn-plugin-func-func-util-rhel8-container" \
       name="openshift-serverless-1/kn-plugin-func-func-util-rhel8" \