ci: skip FreeBSD workflow for docs-only changes

Add path filters so README and docs-only pull requests do not start the FreeBSD GitHub Actions jobs.

Author: moluopro

.github/workflows/freebsd.yml

@@ -4,9 +4,15 @@ on:
   push:
     branches:
       - develop
+    paths-ignore:
+      - 'docs/**'
+      - '**/*.md'
   pull_request:
     branches:
       - develop
+    paths-ignore:
+      - 'docs/**'
+      - '**/*.md'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}