Revert "sysusers/firstboot: temporarily disable LoadCredential"

This reverts commit 7c20dd4.

Debian has now been updated to patch the issue, so SemaphoreCI should
no longer fail. The fix has also been backported to the affected
stable branches.

units/systemd-firstboot.service

@@ -29,12 +29,10 @@ StandardError=tty
 # Optionally, pick up basic fields from credentials passed to the service
 # manager. This is useful for importing this data from nspawn's
 # --set-credential= switch.
-# FIXME: temporarily disabled as it causes asserts on v247/v248, see:
-# https://github.com/systemd/systemd/issues/19178
-#LoadCredential=passwd.hashed-password.root
-#LoadCredential=passwd.plaintext-password.root
-#LoadCredential=passwd.shell.root
-#LoadCredential=firstboot.locale
-#LoadCredential=firstboot.locale-messages
-#LoadCredential=firstboot.keymap
-#LoadCredential=firstboot.timezone
+LoadCredential=passwd.hashed-password.root
+LoadCredential=passwd.plaintext-password.root
+LoadCredential=passwd.shell.root
+LoadCredential=firstboot.locale
+LoadCredential=firstboot.locale-messages
+LoadCredential=firstboot.keymap
+LoadCredential=firstboot.timezone

units/systemd-sysusers.service

@@ -25,8 +25,6 @@ TimeoutSec=90s
 # Optionally, pick up a root password and shell for the root user from a
 # credential passed to the service manager. This is useful for importing this
 # data from nspawn's --set-credential= switch.
-# FIXME: temporarily disabled as it causes asserts on v247/v248, see:
-# https://github.com/systemd/systemd/issues/19178
-#LoadCredential=passwd.hashed-password.root
-#LoadCredential=passwd.plaintext-password.root
-#LoadCredential=passwd.shell.root
+LoadCredential=passwd.hashed-password.root
+LoadCredential=passwd.plaintext-password.root
+LoadCredential=passwd.shell.root