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:29
 
 # Description
 # This image provides an Apache 2.4 + PHP 7.0 environment for running PHP applications.
@@ -20,7 +20,6 @@ RUN dnf install -y --setopt=tsflags=nodocs php php-opcache && \
 ENV PHP_VERSION=7.0 \
     NAME=php\
     VERSION=0 \
-    RELEASE=1 \
     ARCH=x86_64
 
 ENV HOME=/opt/app-root
@@ -28,7 +27,6 @@ ENV HOME=/opt/app-root
 LABEL summary="php runtime" \
       name="$FGC/$NAME" \
       version="$VERSION" \
-      release="$RELEASE.$DISTTAG" \
       architecture="$ARCH" \
       description="Platform for building and running PHP 7.0 applications." \
       vendor="Fedora Project" \