.gitlab-ci.yml: run build and all followup jobs only on master branch

Signed-off-by: Jan-Tarek Butt <tarek@ring0.de>

.gitlab-ci.yml

@@ -90,8 +90,8 @@ parameters:
 
 build:
   stage: build
-  #  only:
-  #  - master
+    only:
+    - master
   tags:
     - firmware
   script:
@@ -101,8 +101,8 @@ build:
 
 sign:
   stage: sign
-  #  only:
-  #    - master
+    only:
+      - master
   tags:
     - firmware
   script:
@@ -111,8 +111,8 @@ sign:
 
 deploy:
   stage: deploy
-  #  only:
-  #    - master
+    only:
+      - master
   tags:
     - firmware
   script:
@@ -121,8 +121,8 @@ deploy:
 
 cleanup:
   stage: cleanup
-  #  only:
-  #    - master
+    only:
+      - master
   tags:
     - firmware
   script: