only run tests when needed

.github/workflows/tests.yml

@@ -6,7 +6,32 @@ on:
   workflow_dispatch:
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+    outputs:
+      server: ${{ steps.filter.outputs.server }}
+      client: ${{ steps.filter.outputs.client }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Detect changed paths
+        uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            server:
+              - 'Overlord-Server/**'
+            client:
+              - 'Overlord-Client/**'
+              - 'go.work'
+              - 'go.work.sum'
+
   server-tests:
+    needs: changes
+    if: needs.changes.outputs.server == 'true' || github.event_name == 'workflow_dispatch'
     strategy:
       fail-fast: false
       matrix:
@@ -31,6 +56,8 @@ jobs:
         run: bun test ./src
 
   client-tests:
+    needs: changes
+    if: needs.changes.outputs.client == 'true' || github.event_name == 'workflow_dispatch'
     strategy:
       fail-fast: false
       matrix: