add test to check if branch is ready for merging

t/merge-ready/perltidy.t

@@ -0,0 +1,23 @@
+use 5.32.0;
+
+use Test2::V0;
+
+use Git::Wrapper;
+use Test::PerlTidy qw( run_tests );
+
+my $target_branch = $ENV{TARGET_BRANCH} // 'main';
+
+my $git = Git::Wrapper->new('.');
+
+my $on_target = grep { "* $target_branch" eq $_ } $git->branch;
+
+if ($on_target) {
+    run_tests();
+}
+else {
+    my @files =
+      $git->diff( { name_only => 1, diff_filter => 'ACMR' }, $target_branch );
+    ok Test::PerlTidy::is_file_tidy($_), $_ for @files;
+}
+
+done_testing;