hack/build-go.sh: Compress the openshift-tests-extension

Compress the openshift-tests-extension binary. Use `--force` to overwrite
the output file if already present to speed up local development. Use `--keep`
to keep the original binary after compressing it so that a developer may use it.

Compressing because [1]:

> Statically linked binaries are prohibited in FIPS and will
> cause failures if detected by product pipeline scans. To
> avoid this, extension binaries should be gzipped before
> being committed to container images.

Such a compressed binary can be then extracted as per [1]:

> After discovering a test extension binary, the origin test framework will
> extract the binary from the container image which carries it and store it
> in /tmp storage of the pod in which it is running.
>
> If the binary-path ends in .gz, the binary will be decompressed.

[1]: https://github.com/openshift/enhancements/blob/c2c0d43e3cd70cf79bc2b101ceb6a03c5e0114a8/enhancements/testing/openshift-tests-extension.md

Author: DavidHurta

hack/build-go.sh

@@ -37,6 +37,9 @@ ${GOFLAGS}                                                                    \
 -o "${BIN_PATH}/openshift-tests-extension"                                    \
 "${REPO}/cmd/openshift-tests-extension/..."
 
+echo "Compressing the openshift-tests-extension binary"
+gzip --keep --force "${BIN_PATH}/openshift-tests-extension"
+
 # Build the cluster-version-operator binary
 GLDFLAGS+="-X ${REPO}/pkg/version.Raw=${VERSION_OVERRIDE}"
 echo "Building ${REPO} cluster-version-operator binary (${VERSION_OVERRIDE})"