plugins: support for repo package sets

This adds support for specifing the package sets for repositories;
on the command line this can be done via `--repo-package-set` with
and argument of `;` separated package set names. This will result
in repo information being transported via dict instead of plain
strings. Thus the hub plugin's schema was modified accordingly.
Last but not least, the builder plugin now can decode these dicts
and setup the repos accordingly.
Test were added for plugins as well as the integration test changed
to use this new feature.
The first upstream commit that supports this feature is pinned.

plugins/builder/osbuild.py

@@ -24,7 +24,7 @@ import time
 import urllib.parse
 
 from string import Template
-from typing import Dict, List, Optional
+from typing import Dict, List, Optional, Union
 
 import requests
 import koji
@@ -80,11 +80,21 @@ class OSTreeOptions:
 
 
 class Repository:
-    def __init__(self, baseurl: str, gpgkey: str = None):
+    def __init__(self, baseurl: str):
         self.baseurl = baseurl
-        self.gpgkey = gpgkey
+        self.gpgkey = None
+        self.package_sets: List[str] = None
         self.rhsm = False
 
+    @classmethod
+    def from_data(cls, data: Union[str, Dict]) -> "Repository":
+        if isinstance(data, str):
+            return cls(data)
+        baseurl = data["baseurl"]
+        repo = cls(baseurl)
+        repo.package_sets = data.get("package_sets")
+        return repo
+
     def as_dict(self, arch: str = ""):
         tmp = Template(self.baseurl)
         url = tmp.substitute(arch=arch)
@@ -95,6 +105,8 @@ class Repository:
         if self.gpgkey:
             res["gpg_key"] = self.gpgkey
             res["check_gpg"] = True
+        if self.package_sets:
+            res["package_sets"] = self.package_sets
         return res
 
 
@@ -532,7 +544,7 @@ class OSBuildImage(BaseTaskHandler):
 
     def make_repos_for_user(self, repos):
         self.logger.debug("user repo override: %s", str(repos))
-        return [Repository(r) for r in repos]
+        return [Repository.from_data(r) for r in repos]
 
     def map_koji_api_image_type(self, image_type: str) -> str:
         mapped = KOJIAPI_IMAGE_TYPES.get(image_type)