ci: don't check repository_owner (#1436)

.github/workflows/conflicts.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   conflicts:
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'nix-community'
+    if: vars.APP_ID
     steps:
       - uses: actions/create-github-app-token@v2
         id: app-token

.github/workflows/labels.yml

@@ -21,7 +21,9 @@ jobs:
   labels:
     name: label-pr
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'nix-community' && !contains(github.event.pull_request.title, '[skip treewide]')   # yamllint disable-line rule:line-length
+    if: >
+      vars.APP_ID &&
+      !contains(github.event.pull_request.title, '[skip treewide]')
     steps:
       - uses: actions/create-github-app-token@v2
         id: app-token

.github/workflows/update-flake.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   flake-update:
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'nix-community'
+    if: vars.APP_ID
     strategy:
       matrix:
         branch: [master, release-25.05]