[gnome-initial-setup] ci: use Fedora 30

[Will Thompson <wjt src gnome org>]

commit 2db08467ef8aae47f03960793d1a14056b29712c
Author: Will Thompson <will willthompson co uk>
Date:   Mon Aug 19 12:15:06 2019 +0100

    ci: use Fedora 30
    
    This essentially reverts 221a627. CI against rawhide is currently
    failing with:
    
        warning: /var/cache/dnf/rawhide-2d95c80a1fa0a67d/packages/ModemManager-glib-1.10.4-2.fc31.x86_64.rpm: 
Header V3 RSA/SHA256 Signature, key ID 12c944d0: NOKEY
        Fedora - Rawhide - Developmental packages for t 210 kB/s | 1.6 kB     00:00
        GPG key at file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-31-x86_64 (0x3C3359C4) is already installed
        The GPG keys listed for the "Fedora - Rawhide - Developmental packages for the next Fedora release" 
repository are already installed but they are not correct for this package.
        Check that the correct key URLs are configured for this repository.. Failing package is: 
ModemManager-glib-1.10.4-2.fc31.x86_64
         GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-31-x86_64
        [... repeat for every other package ...]
        Public key for systemd-rpm-macros-243~rc1-2.fc31.noarch.rpm is not installed. Failing package is: 
systemd-rpm-macros-243~rc1-2.fc31.noarch
         GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-31-x86_64
        The downloaded packages were saved in cache until the next successful transaction.
        You can remove cached packages by executing 'dnf clean packages'.
        Error: GPG check FAILED

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 865a836..a477eac 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: fedora:rawhide
+image: fedora:30
 
 stages:
   - build