Run nightly on single branch with workflow_dispatch and explicit branch

Author: iluuu1994

.github/nightly_matrix.php

@@ -106,8 +106,9 @@ function get_windows_matrix_include(array $branches) {
 if ($discard_cache) {
     @unlink(get_branch_commit_cache_file_path());
 }
+$branch = $argv[3] ?? 'master';
 
-$branches = get_branches();
+$branches = $branch === 'master' ? get_branches() : get_branch_matrix([$branch]);
 $matrix_include = get_matrix_include($branches);
 $windows_matrix_include = get_windows_matrix_include($branches);
 

.github/workflows/nightly.yml

@@ -32,7 +32,7 @@ jobs:
             nightly-
       - name: Generate Matrix
         id: set-matrix
-        run: php .github/nightly_matrix.php "${{ github.event_name }}" "${{ github.run_attempt }}"
+        run: php .github/nightly_matrix.php "${{ github.event_name }}" "${{ github.run_attempt }}" "${{ github.head_ref || github.ref_name }}"
       - name: Notify Slack
         if: failure()
         uses: ./.github/actions/notify-slack