Ensure Munki 7 version_script is string and has shebang

Author: homebysix

CHANGELOG.md

@@ -15,6 +15,7 @@ All notable changes to this project will be documented in this file. This projec
 ### Added
 
 - `check-autopkg-recipes` and `check-munki-pkgsinfo` now validates that `supported_architectures` values are set appropriately.
+- In anticipation of Munki 7, `check-munki-pkgsinfo` validates that `version_script` is a string starting with a script shebang.
 
 ### Changed
 

pre_commit_hooks/check_munki_pkgsinfo.py

@@ -224,6 +224,7 @@ def main(argv=None):
             "preinstall_script",
             "preuninstall_script",
             "uninstall_script",
+            "version_script",
         )
         for s_type in script_types:
             if s_type in pkginfo:

pre_commit_hooks/util.py

@@ -258,6 +258,7 @@ def validate_pkginfo_key_types(pkginfo, filename):
         "uninstaller_item_location": str,
         "update_for": list,
         "version": str,
+        "version_script": str,
     }
 
     passed = True