mkosi: Unify device timeout for CI and local runs

Now that we use KVM and don't use repart anymore to create a root
partition on first boot, let's see if we can use the same device timeout
for both local and CI runs.

.github/workflows/mkosi.yml

@@ -123,15 +123,6 @@ jobs:
         RuntimeBuildSources=no
         EOF
 
-        # These should override the options from mkosi.conf so we put them in a dropin that's ordered later
-        # instead.
-        tee mkosi.conf.d/99-ci.conf <<EOF
-        [Host]
-        KernelCommandLineExtra=
-                # Root device can take a long time to appear, so let's bump the timeout.
-                systemd.default_device_timeout_sec=180
-        EOF
-
     - name: Generate secure boot key
       run: mkosi --debug genkey
 

mkosi.conf

@@ -29,7 +29,7 @@ KernelCommandLine=systemd.crash_shell
                   rw
                   # Lower the default device timeout so we get a shell earlier if the root device does
                   # not appear for some reason.
-                  systemd.default_device_timeout_sec=20
+                  systemd.default_device_timeout_sec=30
                   # Make sure no LSMs are enabled by default.
                   apparmor=0
                   selinux=0