copr-builders: don't do gpg checks for epel-6 builds

Our builders are on Fedora 38 which distrust SHA-1, and I don't see a
way to opt-out from this policy.  Building for epel-6 is already on the
edge, so..

roles/copr/backend/files/provision/files/mock/templates/epel-6.tpl

@@ -8,7 +8,7 @@ name=Extra Packages for Enterprise Linux $releasever - $basearch
 mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-6&arch=$basearch
 failovermethod=priority
 gpgkey=file:///usr/share/distribution-gpg-keys/epel/RPM-GPG-KEY-EPEL-6
-gpgcheck=1
+gpgcheck=0
 skip_if_unavailable=False
 
 [epel-testing]

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -73,7 +73,7 @@
 
 # https://fedoraproject.org/wiki/Changes/StrongCryptoSettings
 - name: fallback to the legacy crypto policies
-  command: update-crypto-policies --set DEFAULT:FEDORA32
+  command: update-crypto-policies --set DEFAULT:SHA1
   when:
     - prepare_base_image is defined