Update KLC Compliance Check to only include changed files

.github/workflows/kicad-klc-check.yml

@@ -29,5 +29,20 @@ jobs:
         with:
           python-version: '3.10.11'
 
-      - name: Run KiCad KLC Footprint Check
-        run: python ./library-utils/klc-check/check_footprint.py ./SimPanel.pretty/* -vv
+      # We use this to limit KLC checking to only changed files
+      - uses: jitterbit/get-changed-files@v1
+        with:
+          format: 'json'
+
+      - id: footprint_files
+        name: Run KiCad KLC Footprint Check
+        uses: jitterbit/get-changed-files@v1
+        with:
+          format: 'json'
+      - run: |
+          readarray -t changed_files <<<"$(jq -r '.[]' <<<'${{ steps.footprint_files.outputs.added_modified }}')"
+          for changed_file in ${changed_files[@]}; do
+            if [[ ${changed_file} == *.kicad_mod ]]; then
+              python ./library-utils/klc-check/check_footprint.py ./SimPanel.pretty/${changed_file} -vv
+            fi
+          done