ci: use gpgme scratch build to workaround issues

Temporarily work around gpgme issues until the package gets into stable.

For more information, see:
https://src.fedoraproject.org/rpms/gpgme/pull-request/3
https://github.com/ostreedev/ostree/pull/1539

Closes: #1540
Approved by: cgwalters

ci/libpaprci/libbuild.sh

@@ -60,6 +60,12 @@ pkg_builddep() {
     # This is sadly the only case where it's a different command
     if test -x /usr/bin/dnf; then
         dnf builddep -y "$@"
+
+        # XXX: tmp hack -- see
+        # https://github.com/ostreedev/ostree/pull/1539
+        if rpm -q gpgme | grep -q gpgme-1.9.0-6.fc27; then
+            dnf install -y https://kojipkgs.fedoraproject.org//packages/gpgme/1.10.0/4.fc27/x86_64/{gpgme{,-devel},python{2,3}-gpg}-1.10.0-4.fc27.x86_64.rpm
+        fi
     else
         yum-builddep -y "$@"
     fi