Only run pipeline when specific RUN_JOB variable value is set

.gitlab-ci.yml

@@ -8,6 +8,8 @@ stages:
 
 update_flake_lock:
   stage: update_flake_lock
+  rules:
+    - if: $RUN_JOB == "update_flake_lock"
   script:
     - nix flake update --extra-experimental-features nix-command --extra-experimental-features flakes
   artifacts:
@@ -16,6 +18,8 @@ update_flake_lock:
 
 apply:
   stage: apply
+  rules:
+    - if: $RUN_JOB == "deploy"
   script:
     - nix-env --install colmena
     - eval $(ssh-agent -s)
@@ -30,6 +34,8 @@ apply:
 
 commit_flake:
   stage: commit_flake
+  rules:
+    - if: $RUN_JOB == "update_flake_lock"
   variables:
     GIT_AUTHOR_EMAIL: $GIT_AUTHOR_EMAIL
     GIT_AUTHOR_NAME: $GIT_AUTHOR_NAME