Resolve #3394413 "Basic pipeline"

Closes #3394413

The goal here is to add a basic pipeline that doesn't run any tests, but builds successfully. The goal is to have a core clone with the Automatic Updates and Package Manager modules converted to core modules.

scripts/src/Converter.php

@@ -60,6 +60,7 @@ class Converter {
     $old_machine_name = 'automatic_updates';
     $new_machine_name = 'auto_updates';
 
+    static::switchToBranches($core_dir, $core_branch, $contrib_branch);
     self::info('Switched branches');
     $fs = new Filesystem();
 
@@ -159,6 +160,7 @@ class Converter {
     else {
       self::info('⚠️Skipped core checks');
     }
+    static::doMakeCommit($core_dir);
     self::info('Make commit');
     self::info("Done. Probably good but you should check before you push. These are the files present in the contrib module absent in core:");
     print shell_exec(sprintf("tree %s/package_manager > /tmp/contrib.txt  && tree %s/core/modules/package_manager > /tmp/core.txt && diff /tmp/contrib.txt /tmp/core.txt", self::getContribDir(), $core_dir));