fixing workflow syntax

Author: cengique

.github/workflows/build-linux.yml

@@ -20,7 +20,7 @@ jobs:
       VERSION: >-
         ${{ ( ( startsWith(github.ref, 'refs/tags') && github.ref_name ) ||
               ( startsWith(github.ref_name, 'v1.3.0') && github.ref_name ) ||
-              ( 'v1.3.0-' env.COMMIT_SHA8 ) ) }}
+              ( join('v1.3.0-', env.COMMIT_SHA8) ) ) }}
 
     steps:
     #- name: set version by tag name (as alternative to above)