Correct image tags for ubuntu

No need to modify them in the master.cfg, just define them correctly in
os_info.yaml

master.cfg

@@ -84,9 +84,6 @@ for w_name in master_config["workers"]:
                     and ("sles" not in os_name)):
                 continue
 
-            if image_tag.startswith("ubuntu"):
-                image_tag = image_tag[:-2] + "." + image_tag[-2:]
-
             quay_name = f'{os.environ["CONTAINER_REGISTRY_URL"]}{image_tag}'
             if arch.startswith("x86"):
                 os_name += "-i386"

os_info.yaml

@@ -172,7 +172,7 @@ sles-1506:
     - s390x
   type: rpm
 ubuntu-2004:
-  image_tag: ubuntu-2004
+  image_tag: ubuntu20.04
   tags:
     - release_packages
     - autobake
@@ -184,7 +184,7 @@ ubuntu-2004:
     - s390x
   type: deb
 ubuntu-2204:
-  image_tag: ubuntu-2204
+  image_tag: ubuntu22.04
   tags:
     - release_packages
     - autobake
@@ -196,7 +196,7 @@ ubuntu-2204:
     - s390x
   type: deb
 ubuntu-2404:
-  image_tag: ubuntu-2404
+  image_tag: ubuntu24.04
   tags:
     - release_packages
     - autobake
@@ -208,7 +208,7 @@ ubuntu-2404:
     - s390x
   type: deb
 ubuntu-2410:
-  image_tag: ubuntu-2410
+  image_tag: ubuntu24.10
   tags:
     - release_packages
     - autobake