[GitHub] FIX SOFA_OS

Author: guparan

.github/workflows/ubuntu.yml

@@ -11,7 +11,7 @@ jobs:
         os: [ubuntu-18.04]
     env:
       SOFA_ROOT: /opt/sofa
-      SYSTEM: Linux
+      SOFA_OS: Linux
 
     steps:
       - name: Checkout source code
@@ -122,7 +122,7 @@ jobs:
         os: [ubuntu-18.04]
     env:
       SOFA_ROOT: /opt/sofa
-      SYSTEM: Linux
+      SOFA_OS: Linux
 
     steps:
       - name: Set env vars