devicetree_checks.yml: Add itself to path filter

So build is run when devicetree_checks.yml is changed.

Signed-off-by: Øyvind Rønningstad <[email protected]>

Author: oyvindronningstad

.github/workflows/devicetree_checks.yml

@@ -8,9 +8,11 @@ on:
   push:
     paths:
     - 'scripts/dts/**'
+    - '.github/workflows/devicetree_checks.yml'
   pull_request:
     paths:
     - 'scripts/dts/**'
+    - '.github/workflows/devicetree_checks.yml'
 
 jobs:
   build: