ostree: Add configuration for custom runroot packages

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

doc/configuration.rst

@@ -1800,6 +1800,8 @@ repository with a new commit.
     * ``tag_ref`` -- (*bool*, default ``True``) If set to ``False``, a git
       reference will not be created.
     * ``ostree_ref`` -- (*str*) To override value ``ref`` from ``treefile``.
+    * ``runroot_packages`` -- (*list*) A list of additional package names to be
+      installed in the runroot environment in Koji.
 
 Example config
 --------------

pungi/checks.py

@@ -1059,6 +1059,9 @@ def make_schema():
                                         "config_branch": {"type": "string"},
                                         "tag_ref": {"type": "boolean"},
                                         "ostree_ref": {"type": "string"},
+                                        "runroot_packages": {
+                                            "$ref": "#/definitions/list_of_strings",
+                                        },
                                     },
                                     "required": [
                                         "treefile",

pungi/phases/ostree.py

@@ -168,7 +168,9 @@ class OSTreeThread(WorkerThread):
                 ("unified-core", config.get("unified_core", False)),
             ]
         )
-        packages = ["pungi", "ostree", "rpm-ostree"]
+        default_packages = ["pungi", "ostree", "rpm-ostree"]
+        additional_packages = config.get("runroot_packages", [])
+        packages = default_packages + additional_packages
         log_file = os.path.join(self.logdir, "runroot.log")
         mounts = [compose.topdir, config["ostree_repo"]]
         runroot = Runroot(compose, phase="ostree")