Drop Release label in favor of OSBS release_bump plugin.

OSBS can automatically bump the release number, for that
we just need to drop the label from the Dockerfile

See https://pagure.io/ContainerSIG/container-sig/issue/1

Signed-off-by: Clement Verna <cverna@tutanota.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora:28
+FROM registry.fedoraproject.org/fedora:29
 
 # Port on which will apache run
 EXPOSE 8080
@@ -7,7 +7,6 @@ EXPOSE 8080
 ENV NAME=perl \
     PERL_VERSION=5.24 \
     VERSION=0 \
-    RELEASE=1 \
     ARCH=x86_64
 
 # Set labels used in OpenShift to describe the builder images
@@ -16,7 +15,6 @@ LABEL com.redhat.component="$NAME" \
       summary="Perl 5 is a highly capable, feature-rich programming language." \
       description="Perl 5 is a highly capable, feature-rich programming language with over 29 years of development. Perl 5 runs on over 100 platforms." \
       version="$VERSION" \
-      release="$RELEASE.$DISTTAG" \
       architecture="$ARCH" \
       usage="s2i build file:///your/app modularitycontainers/perl your-app" \
       io.k8s.description="Platform for building and running Perl 5.24 applications" \