Fix gpg import (#1535)

## Problem

In staging there is no opensuse keys for PXE build which causes build
failure.


https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:adi:34/agama-installer:openSUSE-PXE/images/x86_64


## Solution

Import keys only if there is any available.

live/src/agama-installer.changes

@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Aug 12 12:38:45 UTC 2024 - Josef Reidinger <[email protected]>
+
+- Do not fail if there is no opensuse keys on medium for PXE
+  (gh#openSUSE/agama#1535)
+
 -------------------------------------------------------------------
 Fri Aug  2 08:02:41 UTC 2024 - Ladislav Slezák <[email protected]>
 

live/src/config.sh

@@ -27,8 +27,10 @@ rm /tmp/systemsmanagement_key.gpg
 # import the IBS key for the Devel:YaST:Agama:Head project
 rpm --import /tmp/Devel_YaST_Agama_Head_key.gpg
 rm /tmp/Devel_YaST_Agama_Head_key.gpg
-# import the openSUSE keys
-rpm --import /usr/lib/rpm/gnupg/keys/*.asc
+# import the openSUSE keys, but check if there is any
+if stat -t /usr/lib/rpm/gnupg/keys/*.asc 2>/dev/null 1>/dev/null; then
+  rpm --import /usr/lib/rpm/gnupg/keys/*.asc
+fi
 
 # activate services
 systemctl enable sshd.service