Revert "Adapt Rakefile and GitHub Actions for SLE-15-SP3"

This reverts commit 8750eaa.

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on: [push, pull_request]
 jobs:
   Tests:
     runs-on: ubuntu-latest
-    container: registry.opensuse.org/yast/sle-15/sp3/containers/yast-ruby:latest
+    container: registry.opensuse.org/yast/head/containers/yast-ruby:latest
 
     steps:
 
@@ -33,7 +33,7 @@ jobs:
 
   Rubocop:
     runs-on: ubuntu-latest
-    container: registry.opensuse.org/yast/sle-15/sp3/containers/yast-ruby:latest
+    container: registry.opensuse.org/yast/head/containers/yast-ruby:latest
 
     steps:
 
@@ -45,7 +45,7 @@ jobs:
 
   Package:
     runs-on: ubuntu-latest
-    container: registry.opensuse.org/yast/sle-15/sp3/containers/yast-ruby:latest
+    container: registry.opensuse.org/yast/head/containers/yast-ruby:latest
 
     steps:
 
@@ -57,7 +57,7 @@ jobs:
 
   Yardoc:
     runs-on: ubuntu-latest
-    container: registry.opensuse.org/yast/sle-15/sp3/containers/yast-ruby:latest
+    container: registry.opensuse.org/yast/head/containers/yast-ruby:latest
 
     steps:
 
@@ -71,7 +71,7 @@ jobs:
   # checks into one job avoids that overhead
   Checks:
     runs-on: ubuntu-latest
-    container: registry.opensuse.org/yast/sle-15/sp3/containers/yast-ruby:latest
+    container: registry.opensuse.org/yast/head/containers/yast-ruby:latest
 
     steps:
 

Rakefile

@@ -19,8 +19,6 @@
 
 require "yast/rake"
 
-Yast::Tasks.submit_to :sle15sp3
-
 Yast::Tasks.configuration do |conf|
   conf.skip_license_check << /doc\//
   conf.skip_license_check << /test\/data/