fixup! Add GitHub Actions CI

Author: setotau

.github/workflows/check-dtschema.yml

@@ -8,7 +8,7 @@ on:
     tags:
       - v*-sdm660
 jobs:
-  dbts-check:
+  dtbs-check:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
@@ -21,6 +21,9 @@ jobs:
         with:
           files: |
             **.yaml
+      - name: Update package lists
+        run: |
+          sudo apt update
       - name: Install dependencies
         run: |
           sudo apt install -yqq bison build-essential device-tree-compiler flex gcc-aarch64-linux-gnu python3 python3-dev python3-venv swig