copr: set best=0 for epel-8 chroots, but outside of a template

Because having it in a template didn't work for me, so either PEBKAC
or we need to figure out, how to do it.

roles/copr/backend/files/provision/files/mock/epel-8-aarch64.cfg

@@ -0,0 +1,10 @@
+include('/etc/mock/templates/centos-8.tpl')
+include('/etc/mock/templates/epel-8.tpl')
+
+config_opts['root'] = 'epel-8-aarch64'
+config_opts['target_arch'] = 'aarch64'
+config_opts['legal_host_arches'] = ('aarch64',)
+
+# Unfortunately, we need to temporarily set this
+# See: RHBZ 1756681 and RHBZ 1758467
+best=False

roles/copr/backend/files/provision/files/mock/epel-8-ppc64le.cfg

@@ -0,0 +1,10 @@
+include('/etc/mock/templates/centos-8.tpl')
+include('/etc/mock/templates/epel-8.tpl')
+
+config_opts['root'] = 'epel-8-ppc64le'
+config_opts['target_arch'] = 'ppc64le'
+config_opts['legal_host_arches'] = ('ppc64le',)
+
+# Unfortunately, we need to temporarily set this
+# See: RHBZ 1756681 and RHBZ 1758467
+best=False

roles/copr/backend/files/provision/files/mock/epel-8-x86_64.cfg

@@ -0,0 +1,10 @@
+include('/etc/mock/templates/centos-8.tpl')
+include('/etc/mock/templates/epel-8.tpl')
+
+config_opts['root'] = 'epel-8-x86_64'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+
+# Unfortunately, we need to temporarily set this
+# See: RHBZ 1756681 and RHBZ 1758467
+best=False

roles/copr/backend/files/provision/files/mock/templates/epel-8.tpl

@@ -1,34 +0,0 @@
-config_opts['yum.conf'] += """
-
-# We temporarily want to set this because of RHBZ: 1756681
-best=0
-
-[epel]
-name=epel
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-8&arch=$basearch
-failovermethod=priority
-gpgkey=file:///usr/share/distribution-gpg-keys/epel/RPM-GPG-KEY-EPEL-8
-gpgcheck=1
-skip_if_unavailable=False
-
-[testing]
-name=epel-testing
-enabled=0
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=testing-epel8&arch=$basearch
-failovermethod=priority
-skip_if_unavailable=False
-
-[local]
-name=local
-baseurl=https://kojipkgs.fedoraproject.org/repos/epel8-build/latest/$basearch/
-cost=2000
-enabled=0
-skip_if_unavailable=False
-
-[epel-debuginfo]
-name=epel-debug
-mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-debug-8&arch=$basearch
-failovermethod=priority
-enabled=0
-skip_if_unavailable=False
-"""