Utilize ct install --github-groups in ci workflow

helm/chart-testing#556
Signed-off-by: Marco Franssen <[email protected]>

Author: marcofranssen

.github/workflows/helm-chart-ci.yaml

@@ -153,6 +153,7 @@ jobs:
       - name: Run chart-testing (install)
         run: |
           ct install --config ct.yaml \
+            --github-groups \
             --target-branch ${{ github.base_ref }}
 
       - name: Test summary