CI: check for enabled arch for extra-repos/systemd too (MR 6162)

This check is present for "normal" packages, duplicate it for
ones that are thrown into "retry build with systemd later" list.

We need to explicitly pass with_extra_repos="enabled" arg to
find() to avoid getting cached "package not found in repos" result.

Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
[ci:skip-build]: already built successfully in CI

.ci/lib/build_changed_aports.py

@@ -115,6 +115,15 @@ if __name__ == "__main__":
         # To do this automatically, run 'pmbootstrap config auto_zap_misconfigured_chroots yes'.
         common.run_pmbootstrap(["config", "auto_zap_misconfigured_chroots", "yes"])
 
+        # filter out packages that can't be built for arch
+        # (Iterate over copy of `systemd_pkgs`, because we modify it in this loop)
+        for package in systemd_pkgs.copy():
+            apkbuild_path = pmb.helpers.pmaports.find(package, True, True, with_extra_repos="enabled")
+            apkbuild = pmb.parse._apkbuild.apkbuild(pathlib.Path(apkbuild_path, "APKBUILD"))
+            if not pmb.helpers.pmaports.check_arches(apkbuild["arch"], arch):
+                print(f"(extra-repos/systemd) {package}: not enabled for {arch}, skipping")
+                systemd_pkgs.remove(package)
+
         verify_only = common.commit_message_has_string("[ci:skip-build]")
         if verify_only:
             # [ci:skip-build]: verify checksums