ci: only run one instance of each workflow (#26036)

only allow one running workflow per event for each branch

.github/workflows/selfdrive_tests.yaml

@@ -1,10 +1,15 @@
 name: selfdrive
+
 on:
   push:
     branches-ignore:
       - 'testing-closet*'
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  cancel-in-progress: true
+
 env:
   BASE_IMAGE: openpilot-base
   CL_BASE_IMAGE: openpilot-base-cl

.github/workflows/tools_tests.yaml

@@ -1,8 +1,13 @@
 name: tools
+
 on:
   push:
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  cancel-in-progress: true
+
 env:
   BASE_IMAGE: openpilot-base
   CL_BASE_IMAGE: openpilot-base-cl