Make versions_check more reliable in forks (#7785)

* discover repo
only run in GH actions
use discovered api
this is usefull for GHES enviroments
style fixes

* Fix wrong env name

.github/scripts/version_check.py

@@ -18,6 +18,9 @@
 
 import requests
 
+REPO = os.getenv('GITHUB_REPOSITORY', 'inventree/inventree')
+GITHUB_API_URL = os.getenv('GITHUB_API_URL', 'https://api.github.com')
+
 
 def get_existing_release_tags():
     """Request information on existing releases via the GitHub API."""
@@ -28,9 +31,7 @@ def get_existing_release_tags():
     if token:
         headers = {'Authorization': f'Bearer {token}'}
 
-    response = requests.get(
-        'https://api.github.com/repos/inventree/inventree/releases', headers=headers
-    )
+    response = requests.get(f'{GITHUB_API_URL}/repos/{REPO}/releases', headers=headers)
 
     if response.status_code != 200:
         raise ValueError(
@@ -90,6 +91,11 @@ def check_version_number(version_string, allow_duplicate=False):
 
 
 if __name__ == '__main__':
+    # Ensure that we are running in GH Actions
+    if os.environ.get('GITHUB_ACTIONS', '') != 'true':
+        print('This script is intended to be run within a GitHub Action!')
+        sys.exit(1)
+
     if 'only_version' in sys.argv:
         here = Path(__file__).parent.absolute()
         version_file = here.joinpath(
@@ -102,14 +108,13 @@ def check_version_number(version_string, allow_duplicate=False):
             results[0] = str(int(results[0]) - 1)
         print(results[0])
         exit(0)
+
     # GITHUB_REF_TYPE may be either 'branch' or 'tag'
     GITHUB_REF_TYPE = os.environ['GITHUB_REF_TYPE']
 
     # GITHUB_REF may be either 'refs/heads/<branch>' or 'refs/heads/<tag>'
     GITHUB_REF = os.environ['GITHUB_REF']
-
     GITHUB_REF_NAME = os.environ['GITHUB_REF_NAME']
-
     GITHUB_BASE_REF = os.environ['GITHUB_BASE_REF']
 
     # Print out version information, makes debugging actions *much* easier!
@@ -193,7 +198,7 @@ def check_version_number(version_string, allow_duplicate=False):
     # Ref: https://getridbug.com/python/how-to-set-environment-variables-in-github-actions-using-python/
     with open(os.getenv('GITHUB_ENV'), 'a') as env_file:
         # Construct tag string
-        tags = ','.join([f'inventree/inventree:{tag}' for tag in docker_tags])
+        tags = ','.join([f'{REPO}:{tag}' for tag in docker_tags])
 
         env_file.write(f'docker_tags={tags}\n')