Trigger CI only if code files are modified. (pydata#9006)

* Trigger CI only if code files are modified.

Fixes pydata#8705

* Apply suggestions from code review

Co-authored-by: Maximilian Roos <5635139+max-sixty@users.noreply.github.com>

---------

Co-authored-by: Maximilian Roos <5635139+max-sixty@users.noreply.github.com>

Author: dcherian

.github/workflows/ci-additional.yaml

@@ -6,6 +6,12 @@ on:
   pull_request:
     branches:
       - "main"
+    paths:
+      - 'ci/**'
+      - '.github/**'
+      - '/*'  # covers files such as `pyproject.toml`
+      - 'properties/**'
+      - 'xarray/**'
   workflow_dispatch: # allows you to trigger manually
 
 concurrency:

.github/workflows/ci.yaml

@@ -6,6 +6,12 @@ on:
   pull_request:
     branches:
       - "main"
+    paths:
+      - 'ci/**'
+      - '.github/**'
+      - '/*'  # covers files such as `pyproject.toml`
+      - 'properties/**'
+      - 'xarray/**'
   workflow_dispatch: # allows you to trigger manually
 
 concurrency: