fedora.repo: add modular repos

This is prep for having `testing-devel` be the source of truth for all
the files other than the lockfile and manifest (see [1]). We just have
one `fedora.repo` file which contains all the repos we care about, but
only actually enable the appropriate ones for each stream independently.

In this case, once packages are tagged, `testing-devel` will just use
the `coreos-pool` repo.

[1] coreos/fedora-coreos-tracker#204

fedora.repo

@@ -34,3 +34,28 @@ gpgcheck=1
 metadata_expire=6h
 gpgkey=file:///usr/share/distribution-gpg-keys/fedora/RPM-GPG-KEY-fedora-$releasever-primary
 skip_if_unavailable=False
+
+[fedora-modular]
+name=Fedora Modular $releasever - $basearch
+baseurl=https://dl.fedoraproject.org/pub/fedora/linux/releases/$releasever/Modular/$basearch/os/
+#metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-modular-$releasever&arch=$basearch
+enabled=1
+#metadata_expire=7d
+repo_gpgcheck=0
+type=rpm
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$releasever-$basearch
+skip_if_unavailable=False
+
+[fedora-updates-modular]
+name=Fedora Modular $releasever - $basearch - Updates
+failovermethod=priority
+baseurl=https://dl.fedoraproject.org/pub/fedora/linux/updates/$releasever/Modular/$basearch/
+#metalink=https://mirrors.fedoraproject.org/metalink?repo=updates-released-modular-f$releasever&arch=$basearch
+enabled=1
+repo_gpgcheck=0
+type=rpm
+gpgcheck=1
+metadata_expire=6h
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$releasever-$basearch
+skip_if_unavailable=False