allow passing manifest-path to the action

Author: keewis

action.yaml

@@ -17,8 +17,12 @@ inputs:
       Time machine for testing
     required: false
     type: string
+  manifest-path: >-
+    description: >-
+      Path to the manifest file of `pixi`. Required for `pixi` environments.
+    required: false
+    type: string
 outputs: {}
-
 runs:
   using: "composite"
 
@@ -38,8 +42,10 @@ runs:
         POLICY_PATH: ${{ inputs.policy }}
         ENVIRONMENT_PATHS: ${{ inputs.environment-paths }}
         TODAY: ${{ inputs.today }}
+        MANIFEST_PATH: ${{ inputs.manifest-path }}
       run: |
         python -m minimum_versions validate \
           --today="$TODAY" \
           --policy="$POLICY_PATH" \
+          --manifest-path="$MANIFEST_PATH" \
           $ENVIRONMENT_PATHS

minimum_versions/main.py

@@ -2,6 +2,7 @@
 import os.path
 import pathlib
 import sys
+from typing import Any
 
 import rich_click as click
 from rich.console import Console
@@ -24,6 +25,16 @@ def parse_date(string):
     return datetime.datetime.strptime(string, "%Y-%m-%d").date()
 
 
+class _Path(click.Path):
+    def convert(
+        self, value: Any, param: click.Parameter | None, ctx: click.Context | None
+    ) -> Any:
+        if not value:
+            return None
+
+        return super().convert(value, param, ctx)
+
+
 @click.group()
 def main():
     pass
@@ -34,7 +45,7 @@ def main():
 @click.option(
     "--manifest-path",
     "manifest_path",
-    type=click.Path(exists=True, path_type=pathlib.Path),
+    type=_Path(exists=True, path_type=pathlib.Path),
     default=None,
 )
 @click.option("--today", type=parse_date, default=None)