Fix local build of OSPdO agent for RHEL 9 environments

[abays]

For some reason we use CGO_ENABLED=1 for the OSPdO agent build. We do not use this for the operator build itself [1]. When it is enabled and the agent is built on a RHEL 9 machine, the resulting image will crashloop when deployed in a 4.16 cluster:

# oc logs openstack-677fbd7745-7pljr -c osp-provision-ip-discovery-agent
/osp-director-agent: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /osp-director-agent)
/osp-director-agent: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /osp-director-agent)

We should align this flag between the agent build and the operator build so that we are consistent and avoid the aforementioned issue.

[1]

osp-director-operator/Dockerfile

Line 27 in 80bbaf2

RUN if [ -f $CACHITO_ENV_FILE ] ; then source $CACHITO_ENV_FILE ; fi ; CGO_ENABLED=0 GO111MODULE=on go build ${GO_BUILD_EXTRA_ARGS} -a -o ${DEST_ROOT}/manager main.go

[openshift-ci]

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[stuggi]

looks good to me, but lets get some feedback from @dprince who created it initially with CGO_ENABLED=1