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/f26/s2i-base:latest
+FROM registry.fedoraproject.org/f30/s2i-base:latest
 
 # nginx 1.12 image.
 #
@@ -11,7 +11,6 @@ EXPOSE 8443
 ENV NAME=nginx \
     NGINX_VERSION=1.12 \
     VERSION=0 \
-    RELEASE=1 \
     ARCH=x86_64
 
 ENV SUMMARY="Platform for running nginx $NGINX_VERSION or building nginx-based application" \
@@ -31,7 +30,6 @@ LABEL summary="$SUMMARY" \
       com.redhat.component="$NAME" \
       name="$FGC/$NAME" \
       version="$VERSION" \
-      release="$RELEASE.$DISTTAG" \
       architecture="$ARCH" \
       usage="s2i build file:///your/app $FGC/nginx your-app"