enable modularity copr repo in copr-backend

roles/copr/backend/files/yum/_copr_@modularity-modulemd.custom.repo

@@ -0,0 +1,12 @@
+[group_modularity-modulemd_custom]
+name=Copr Modularity repo
+failovermethod=priority
+baseurl=file:///var/lib/copr/public_html/results/@modularity/modulemd/fedora-$releasever-x86_64/
+        http://209.132.184.48/results/@modularity/modulemd/fedora-$releasever-x86_64/
+        https://copr-be.cloud.fedoraproject.org/results/@modularity/modulemd/fedora-$releasever-x86_64/
+        http://172.25.32.109/results/@modularity/modulemd/fedora-$releasever-x86_64/
+
+gpgcheck=1
+gpgkey=https://copr-be.cloud.fedoraproject.org/results/@modularity/modulemd/pubkey.gpg
+enabled=1
+skip_if_unavailable=1

roles/copr/backend/tasks/main.yml

@@ -5,6 +5,11 @@
 - name: setup networking
   include: "network.yml"
 
+- name: install copr modularity repofile
+  copy: src="yum/_copr_@modularity-modulemd.custom.repo" dest="/etc/yum.repos.d/_copr_@modularity-modulemd.custom.repo"
+  tags:
+  - config
+
 # BZ 1241507
 - name: install copr-backend
   shell: yum-deprecated install -y copr-backend || yum install -y copr-backend