ci(check-examples): only run on source change (#1356)

* ci(check-examples): only run on source change

* ci(check-examples):  simulate source change

* ci(check-examples): fix expression

* ci(check-examples): simulate source change

* ci(check-examples): test change against files

* ci(check-examples): adjust expression

* ci(check-examples): remove quotes

* ci(check-examples): use from json

* ci(check-examples): set output value

* ci(check-examples): remove simulated change

.github/workflows/check-examples.yml

@@ -14,6 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
+      source_changed: ${{ steps.set-source-changed.outputs.source_changed }}
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -34,9 +35,36 @@ jobs:
           echo "Example Directories: $examples"
           echo "matrix={\"directory\":$examples}" >> "$GITHUB_OUTPUT"
 
+      - name: Get source files that changed
+        id: changed-source
+        uses: tj-actions/changed-files@v36
+        with:
+          files: |
+            integrations
+            leptos
+            leptos_config
+            leptos_dom
+            leptos_hot_reload
+            leptos_macro
+            leptos_reactive
+            leptos_server
+            meta
+            router
+            server_fn
+            server_fn_macro
+
+      - name: List source files that changed
+        run: echo '${{ steps.changed-source.outputs.all_changed_files }}'
+
+      - name: Set source_changed
+        id: set-source-changed
+        run: |
+          echo "source_changed=${{ steps.changed-source.outputs.any_changed }}" >> "$GITHUB_OUTPUT"
+
   matrix-job:
     name: Check
     needs: [setup]
+    if: needs.setup.outputs.source_changed == 'true'
     strategy:
       matrix: ${{ fromJSON(needs.setup.outputs.matrix) }}
       fail-fast: false