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:26
+FROM registry.fedoraproject.org/fedora:28
 
 # Description
 # Environment:
@@ -18,13 +18,11 @@ RUN dnf install -y --setopt=tsflags=nodocs nodejs npm && \
 
 ENV NAME=nodejs \
     VERSION=0 \
-    RELEASE=1 \
     ARCH=x86_64
 
 LABEL summary="Javascript runtime." \
        name="$FGC/$NAME" \
        version="$VERSION" \
-       release="$RELEASE.$DISTTAG" \
        architecture="$ARCH" \
        description="Node.js is a platform built on V8 JavaScript Engine for easily building fast, scalable network applications." \
        vendor="Fedora Project" \