buildinstall: Add ability to install extra packages in runroot

Resolves: https://pagure.io/pungi/issue/1461
Merges: https://pagure.io/pungi/pull-request/1580
JIRA: RHELCMP-2911
Signed-off-by: Ozan Unsal <ounsal@redhat.com>

doc/configuration.rst

@@ -672,6 +672,11 @@ Options
 **buildinstall_allow_reuse** = False
     (*bool*) -- When set to ``True``, *Pungi* will try to reuse buildinstall
     results from old compose specified by ``--old-composes``.
+**buildinstall_packages**
+    (list) – Additional packages to be installed in the runroot environment
+    where lorax will run to create installer. Format: ``[(variant_uid_regex,
+    {arch|*: [package_globs]})]``.
+
 
 Example
 -------
@@ -706,6 +711,13 @@ Example
         })
     ]
 
+    # Additional packages to be installed in the Koji runroot environment where
+    # lorax will run.
+    buildinstall_packages = [
+        ('^Simple$', {
+            '*': ['dummy-package'],
+        })
+    ]
 
 .. note::
 

pungi/checks.py

@@ -785,6 +785,10 @@ def make_schema():
             "buildinstall_kickstart": {"$ref": "#/definitions/str_or_scm_dict"},
             "buildinstall_use_guestmount": {"type": "boolean", "default": True},
             "buildinstall_skip": _variant_arch_mapping({"type": "boolean"}),
+            "buildinstall_packages": {
+                "$ref": "#/definitions/package_mapping",
+                "default": [],
+            },
             "global_ksurl": {"type": "url"},
             "global_version": {"type": "string"},
             "global_target": {"type": "string"},

pungi/phases/buildinstall.py

@@ -809,7 +809,9 @@ class BuildinstallThread(WorkerThread):
             chown_paths.append(_get_log_dir(compose, variant, arch))
         elif buildinstall_method == "buildinstall":
             packages += ["anaconda"]
-
+        packages += get_arch_variant_data(
+            compose.conf, "buildinstall_packages", arch, variant
+        )
         if self._reuse_old_buildinstall_result(
             compose, arch, variant, cmd, pkgset_phase
         ):