no install if already found (#438)

Signed-off-by: Dan Huang <[email protected]>

Author: dhuangnm

.github/workflows/test.yml

@@ -90,7 +90,13 @@ jobs:
                   python-version: ${{ inputs.python }}
 
             - name: install system dependencies
-              run: sudo apt update && sudo apt install -y g++ gcc git-all
+              run: |
+                if command -v g++ >/dev/null 2>&1; then
+                  echo "found g++ compiler"
+                else
+                   echo "installing g++ etc compilers..."
+                   sudo apt update && sudo apt install -y g++ gcc
+                fi
               shell: bash
 
             - name: checkout code