pmb: Migrate pkgrel_bump to Command + pmb.commands: Migrate if ... else chain to match

See individual commits.

pmb/commands/__init__.py

@@ -15,6 +15,7 @@ from .index import Index
 from .repo_bootstrap import RepoBootstrap
 from .shutdown import Shutdown
 from .test import Test
+from .pkgrel_bump import PkgrelBump
 from .pull import Pull
 from .kconfig_check import KConfigCheck
 from .kconfig_edit import KConfigEdit
@@ -32,7 +33,6 @@ unmigrated_commands = [
     "flasher",
     "initfs",
     "qemu",
-    "pkgrel_bump",
     "aportupgrade",
     "newapkbuild",
     "lint",
@@ -74,6 +74,8 @@ def run_command(args: PmbArgs):
         command = Shutdown()
     elif args.action == "test":
         command = Test(args.action_test)
+    elif args.action == "pkgrel_bump":
+        command = PkgrelBump(args.packages, args.dry, args.auto)
     elif args.action == "pull":
         command = Pull()
     elif args.action == "kconfig" and args.action_kconfig == "check":