feat(cli): allow filtering apps via a csv file

Author: uptickmetachu

gitops/utils/apps.py

@@ -1,3 +1,4 @@
+import pathlib
 import sys
 from pathlib import Path
 from typing import Literal
@@ -77,15 +78,23 @@ def get_apps(  # noqa: C901
     `exclude`. The incoming filter and exclude params may come in as a list or commastring.
     For the purpose of this filtering, app names and image tag prefixes are also considered as
     tags. For instance, you can do get_apps(tags=[emeriss, production], exclude=[arafire]).
+
+    If filter is a file like name; read a list of app names from the file.
+
     Calling this method without any args returns all apps.
     There are three modes for communicating selected apps to the user:
     - PROMPT: Prints selected apps and asks for confirmation to proceed.
     - PREVIEW: Prints selected apps then proceeds.
     - SILENT: Proceeds without printing.
     Apps with the `inactive` tag are excluded by default, unless requested otherwise.
     """
+    app_names: list[str] = []
+
     if filter == "all":
         filter = set()
+    elif isinstance(filter, str) and pathlib.Path(filter).is_file():
+        app_names = [f.strip() for f in pathlib.Path(filter).read_text().splitlines() if f.strip()]
+        filter = set()
     else:
         filter = set(filter.split(",") if filter and isinstance(filter, str) else filter)
 
@@ -114,7 +123,12 @@ def get_apps(  # noqa: C901
 
         tags = set(app.tags + pseudotags)
         existing_tags |= tags
-        if filter <= tags and not exclude & tags:
+
+        # Decide whether to include the app based on the filter and exclude tags.
+        if app_names:
+            if app.name in app_names:
+                apps.append(app)
+        elif filter <= tags and not exclude & tags:
             apps.append(app)
 
     validate_tags(filter | exclude, existing_tags)