workflows/codeowners: improve test-ability in forks

This allows to at least run basic codeowner stuff in forks.

.github/workflows/codeowners-v2.yml

@@ -45,7 +45,6 @@ jobs:
   check:
     name: Check
     runs-on: ubuntu-24.04-arm
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -91,7 +90,6 @@ jobs:
   request:
     name: Request
     runs-on: ubuntu-24.04-arm
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: cachix/install-nix-action@526118121621777ccd86f79b04685a9319637641 # v31
 
@@ -101,6 +99,9 @@ jobs:
         with:
           path: trusted
 
+      - name: Build review request package
+        run: nix-build trusted/ci -A requestReviews
+
       - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
         if: vars.OWNER_APP_ID
         id: app-token
@@ -111,9 +112,6 @@ jobs:
           permission-members: read
           permission-pull-requests: write
 
-      - name: Build review request package
-        run: nix-build trusted/ci -A requestReviews
-
       - name: Request reviews
         if: steps.app-token.outputs.token
         env: