Replaced sigmatools tests with sigma-cli check

.github/workflows/sigma-test.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a single version of Python
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Sigma Tools and Rule Tests
+name: Sigma Rule Tests
 
 on:
   push:
@@ -23,16 +23,10 @@ jobs:
         python-version: 3.8
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
-        pip install pipenv==2021.5.29
-        pipenv lock
-        pipenv install --dev --deploy
-    - name: Test Sigma Tools and Rules
+        pip install sigma-cli~=0.3.2
+    - name: Test Sigma Rule Syntax
       run: |
-        pipenv run make test
-    - name: Test SQL(ite) Backend
-      run: |
-        pipenv run make test-backend-sql
+        sigma check rules
   yamllint:
     runs-on: ubuntu-latest
     steps: