ci: switch workflows to Default runner group

Signed-off-by: Christoph Heiss <christoph.heiss@robo4you.at>

.github/workflows/package.yaml

@@ -7,7 +7,9 @@ on:
 
 jobs:
   package:
-    runs-on: ubuntu-24.04
+    runs-on:
+      group: Default
+
     strategy:
       matrix:
         platform: [linux/arm64/v8]

.github/workflows/test.yaml

@@ -2,7 +2,8 @@ name: Build and test
 
 on:
   push:
-    branches: ["master"]
+    branches:
+      - master
   pull_request:
 
 env:
@@ -10,7 +11,8 @@ env:
 
 jobs:
   test:
-    runs-on: ubuntu-24.04
+    runs-on:
+      group: Default
 
     steps:
       - name: Install dependencies