MDBF-1067: rpm upgrade to use osname/version/arch in update urls

Except for Rocky Linux and AlmaLinux which has out of sync rpm layout
on our archive/mirrors.

buildarch becomes the arch property in the install/upgrade builders
which in the bash_lib.sh becomes a $arch bash variable.

This is appended to https://mirror.mariadb.org/yum/$mariadb_version/
and https://archive.mariadb.org/mariadb-$mariadb_version/yum/ in
the bash_lib.sh script to form the urls for upgrade tests.

Author: grooverdan

master-libvirt/master.cfg

@@ -247,15 +247,21 @@ for builder_name in BUILDERS_INSTALL:
     elif builder_type == "rpm":
         factory_install = f_rpm_install
         factory_upgrade = f_rpm_upgrade
-        build_arch = (
-            os_name + str(OS_INFO[os_info_name]["version_name"]) + "-" + platform
-        )
-
-    # FIXME - all RPM's should follow the same conventions!
-    if os_name == "centos" and OS_INFO[os_info_name]["version_name"] >= 9:
-        if platform == "amd64":
-            platform = "x86_64"
-        build_arch = f"centos/{OS_INFO[os_info_name]['version_name']}/{platform}"
+        if os_name.startswith("rockylinux") or os_name.startswith("almalinux"):
+            # FIXME - all RPM's should follow the same conventions!
+            build_arch = (
+                os_name + str(OS_INFO[os_info_name]["version_name"]) + "-" + platform
+            )
+        else:
+            if platform == "amd64":
+                platform = "x86_64"
+            build_arch = (
+                os_name
+                + "/"
+                + str(OS_INFO[os_info_name]["version_name"])
+                + "/"
+                + platform
+            )
 
     c["builders"].append(
         util.BuilderConfig(