Add debug step to check runner environment

.gitea/workflows/docker-build.yml

@@ -15,6 +15,17 @@ jobs:
     runs-on: docker
     
     steps:
+      - name: Debug environment
+        run: |
+          echo "=== Environment Debug ==="
+          echo "PWD: $PWD"
+          echo "GITHUB_WORKSPACE: $GITHUB_WORKSPACE"
+          echo "PATH: $PATH"
+          echo "User: $(whoami)"
+          which docker || echo "Docker not in PATH"
+          ls -la /var/run/docker.sock || echo "No docker socket"
+          env | grep -i docker || echo "No docker env vars"
+          
       - name: Build Docker image
         run: |
           cd $GITHUB_WORKSPACE