Fix overly broad check for existing miniforge build files

The glob pattern we were using was too permissive and detecting
miniconda build scripts as miniforge build scripts when they shared the
same version. I have rewritten the pattern matching code to ensure we
only look at files starting with `miniforge` and `mambaforge`.

plugins/python-build/scripts/add_miniforge.py

@@ -100,6 +100,6 @@ for release in requests.get(f'https://api.github.com/repos/{MINIFORGE_REPO}/rele
 
     logger.info('Looking for %(version)s in %(out_dir)s', locals())
 
-    if not list(out_dir.glob(f'*-{version}')):
+    if any(not list(out_dir.glob(f'{distribution}*-{version}')) for distribution in DISTRIBUTIONS):
         logger.info('Downloading %(version)s', locals())
         add_version(release)