test-scenarios shoud ignore duplicated tests (#71)

Author: eitsupi

.github/workflows/test.yaml

@@ -43,7 +43,7 @@ jobs:
         run: npm install -g @devcontainers/cli
 
       - name: "Generating tests for '${{ matrix.features }}' scenarios"
-        run: devcontainer features test -f ${{ matrix.features }} --skip-autogenerated .
+        run: devcontainer features test -f ${{ matrix.features }} --skip-autogenerated --skip-duplicated .
 
   test-global:
     runs-on: ubuntu-latest