mkosi: Disable ext4's orphan_file feature for centos images

Not supported by e2fsck from centos. We also disable building repart
from source in CI as running it from the build directory means repart
will run mkfs.ext4 from the host which doesn't know about the orphan_file
feature causing it to fail.

.github/workflows/mkosi.yml

@@ -169,7 +169,7 @@ jobs:
             -Dtpm2=enabled \
             -Dlibcryptsetup=enabled \
             -Dlibcurl=enabled \
-            -Drepart=enabled \
+            -Drepart=disabled \
             -Dfirstboot=true \
             -Dsysusers=true \
             -Dtmpfiles=true \

mkosi.conf.d/10-centos.conf

@@ -8,3 +8,6 @@ Distribution=centos
 Repositories=epel
              epel-next
              hyperscale-packages-main
+
+[Content]
+Environment=SYSTEMD_REPART_MKFS_OPTIONS_EXT4="-O ^orphan_file"