[dockerfile] Adds Dockerfile.rhel for OpenShift build

Dockerfile

@@ -1,3 +1,4 @@
+# This Dockerfile is used to build the image available on DockerHub
 FROM centos:centos7
 
 # Add everything
@@ -16,14 +17,6 @@ RUN rpm --import https://mirror.go-repo.io/centos/RPM-GPG-KEY-GO-REPO && \
 
 WORKDIR /
 
-LABEL io.k8s.display-name="Multus CNI" \
-      io.k8s.description="This is a component of OpenShift Container Platform and provides a meta CNI plugin." \
-      io.openshift.tags="openshift" \
-      maintainer="Doug Smith <dosmith@redhat.com>"
-
 ADD ./images/entrypoint.sh /
 
-# does it require a root user?
-# USER 1001
-
 ENTRYPOINT ["/entrypoint.sh"]

Dockerfile.rhel

@@ -0,0 +1,28 @@
+# This dockerfile is specific to building Multus for OpenShift
+FROM rhel:rhel7
+
+# Add everything
+ADD . /usr/src/multus-cni
+
+ENV INSTALL_PKGS "git golang"
+RUN yum install -y $INSTALL_PKGS && \
+    rpm -V $INSTALL_PKGS && \
+    cd /usr/src/multus-cni && \
+    ./build && \
+    yum autoremove -y $INSTALL_PKGS && \
+    yum clean all && \
+    rm -rf /tmp/*
+
+WORKDIR /
+
+LABEL io.k8s.display-name="Multus CNI" \
+      io.k8s.description="This is a component of OpenShift Container Platform and provides a meta CNI plugin." \
+      io.openshift.tags="openshift" \
+      maintainer="Doug Smith <dosmith@redhat.com>"
+
+ADD ./images/entrypoint.sh /
+
+# does it require a root user?
+# USER 1001
+
+ENTRYPOINT ["/entrypoint.sh"]