ci: removing default branch hard coding

Author: DeveloperC286

.gitlab-ci.yml

@@ -41,7 +41,7 @@ formatting:
     - earthly --ci +check-formatting
   rules:
     - if: $CI_MERGE_REQUEST_ID
-    - if: $CI_COMMIT_BRANCH == "master"
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 
 linting:
@@ -50,7 +50,7 @@ linting:
     - earthly --ci +linting
   rules:
     - if: $CI_MERGE_REQUEST_ID
-    - if: $CI_COMMIT_BRANCH == "master"
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 
 compiling:
@@ -59,7 +59,7 @@ compiling:
     - earthly --ci +compiling
   rules:
     - if: $CI_MERGE_REQUEST_ID
-    - if: $CI_COMMIT_BRANCH == "master"
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 
 unit-testing:
@@ -68,4 +68,4 @@ unit-testing:
     - earthly --ci +unit-testing
   rules:
     - if: $CI_MERGE_REQUEST_ID
-    - if: $CI_COMMIT_BRANCH == "master"
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH