Fix null variable checks in ci syntax

.gitlab-ci.yml

@@ -29,7 +29,7 @@ build-clazy:
         -DCI_BUILD=ON -DFETCHCONTENT_QUIET=OFF -DCMAKE_CXX_COMPILER=clazy
     - cmake --build build
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -66,7 +66,7 @@ build-gcc11:
   after_script:
     - mv ../.hunter .hunter
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -105,7 +105,7 @@ build-gcc10:
   after_script:
     - mv ../.hunter .hunter
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -135,7 +135,7 @@ build-macos:
   after_script:
     - mv ../.hunter .hunter
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   artifacts:
     paths:
       - build/nheko.app
@@ -196,7 +196,7 @@ build-flatpak-amd64:
     - (cd ./scripts && ./upload-to-flatpak-repo.sh ../build-flatpak/repo) || true
     - bash ./.ci/upload-nightly-gitlab.sh build-flatpak/nheko-amd64.flatpak
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -226,7 +226,7 @@ build-flatpak-arm64:
     - (cd ./scripts && ./upload-to-flatpak-repo.sh ../build-flatpak/repo) || true
     - bash ./.ci/upload-nightly-gitlab.sh build-flatpak/nheko-arm64.flatpak
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -249,5 +249,5 @@ linting:
     - make lint
     - make license
   rules:
-    - if : '!$CI_PIPELINE_TRIGGERED'
+    - if : '$CI_PIPELINE_TRIGGERED == null'