Disable SCL sources from vault

Every 7.x point release breaks the repodata directory, so let's just disable the sources from vault entirely.

7/Dockerfile

@@ -22,9 +22,10 @@ RUN yum install -y \
   gcc gcc-c++ \
  && yum clean all
 
-# Note: we are disabling scl-rh source since it disappeared from vault
+# Note: we are disabling scl-rh & scl source since it disappeared from vault (repodata is missing on every point release)
 RUN yum install -y centos-release-scl centos-release-scl-rh scl-utils-build \
- && sed -i -e '/centos-sclo-rh-source/,+5 s/^/#/' /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo
+ && sed -i -e '/centos-sclo-rh-source/,+5 s/^/#/' /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo \
+ && sed -i -e '/centos-sclo-sclo-source/,+5 s/^/#/' /etc/yum.repos.d/CentOS-SCLo-scl.repo
 
 RUN wget -O /etc/yum.repos.d/ICINGA-release.repo \
  https://packages.icinga.com/epel/ICINGA-release.repo