Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -2,29 +2,31 @@ stages:          # List of stages for jobs, and their order of execution
   - install
   - test
 
+############ YAML ANCHORS ############
+.script_install_template: &script_install_definition
+  - apt-get update -y
+  - apt-get install expect -y
+  - apt-get install lbs-core -y
+  - ./auto_script_wolf
+
+
 installation-test-xenial:       # This job runs in the build stage, which runs first.
   stage: install
   image: ubuntu:16.04
   script:
-    - apt-get update -y
-    - apt-get install expect -y
-    - ./auto_script_wolf
+    - *script_install_definition
 
 installation-test-bionic:       # This job runs in the build stage, which runs first.
   stage: install
   image: ubuntu:18.04
   script:
-    - apt-get update -y
-    - apt-get install expect -y
-    - ./auto_script_wolf
+    - *script_install_definition
 
 installation-test-focal:       # This job runs in the build stage, which runs first.
   stage: install
   image: ubuntu:20.04
   script:
-    - apt-get update -y
-    - apt-get install expect -y
-    - ./auto_script_wolf
+    - *script_install_definition
 
 lint-test-job:   # This job also runs in the test stage.
   stage: test    # It can run at the same time as unit-test-job (in parallel).