Simplify Linux test job definition

.gitlab-ci.yml

@@ -17,14 +17,10 @@ stages:
       - build/distributions
       - build/libs
 
-.test-linux:
-  extends: .test-common
-  variables:
-    DEBIAN_FRONTEND: noninteractive
-
 test:linux:
-  extends: .test-linux
   image: eclipse-temurin:17
+  variables:
+    DEBIAN_FRONTEND: noninteractive
   before_script:
     - apt-get update
     - apt-get install --assume-yes build-essential fakeroot cmake git build-essential libboost-all-dev wget curl