ci: fix build workflows - remove defaults.run.working-directory

All 4 build jobs failed because defaults.run.working-directory
chdir'd into subdirs before checkout created them.

- Remove defaults.run.working-directory from all reusable workflows
- Add per-step working-directory to run steps that need it
- Auth config step runs from repo root (no working-directory)

.gitea/workflows/build_device_agent.yaml

@@ -13,12 +13,10 @@ jobs:
         exclude:
           - goos: windows
             goarch: arm64
-    defaults:
-      run:
-        working-directory: apps/device-agent
     steps:
       - name: Configure git auth for submodules
         run: git config --global url."https://x-access-token:${{ secrets.BUILD_TOKEN }}@git.datadunia.com/".insteadOf "https://git.datadunia.com/"
+
       - uses: actions/checkout@v4
         with:
           submodules: true
@@ -31,6 +29,7 @@ jobs:
           go-version: '1.26'
 
       - name: Build
+        working-directory: apps/device-agent
         env:
           CGO_ENABLED: '0'
           GOOS: ${{ matrix.goos }}