workflows: make checks work with non-NixOS repos

No need for that limitation, which only artifically limits test-ability
of CI in forks.

Some other workflows like backports, cherry-pick checks and periodic
merges are very specific to the release branches and don't need to be
run in forks.

.github/workflows/check-maintainers-sorted.yml

@@ -12,7 +12,6 @@ jobs:
   nixos:
     name: maintainer-list-check
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:

.github/workflows/editorconfig-v2.yml

@@ -18,14 +18,14 @@ jobs:
     name: editorconfig-check
     runs-on: ubuntu-24.04
     needs: get-merge-commit
-    if: "needs.get-merge-commit.outputs.mergedSha && github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
+    if: "needs.get-merge-commit.outputs.mergedSha && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:
       - name: Get list of changed files from PR
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           gh api \
-            repos/NixOS/nixpkgs/pulls/${{github.event.number}}/files --paginate \
+            repos/${{ github.repository }}/pulls/${{ github.event.number }}/files --paginate \
             | jq '.[] | select(.status != "removed") | .filename' \
             > "$HOME/changed_files"
 

.github/workflows/manual-nixos-v2.yml

@@ -14,7 +14,6 @@ jobs:
   nixos:
     name: nixos-manual-build
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -27,6 +26,7 @@ jobs:
           extra_nix_config: sandbox = true
 
       - uses: cachix/cachix-action@ad2ddac53f961de1989924296a1f236fcfbaa4fc # v15
+        if: github.repository_owner == 'NixOS'
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci

.github/workflows/manual-nixpkgs-v2.yml

@@ -16,7 +16,6 @@ jobs:
   nixpkgs:
     name: nixpkgs-manual-build
     runs-on: ubuntu-24.04
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -29,6 +28,7 @@ jobs:
           extra_nix_config: sandbox = true
 
       - uses: cachix/cachix-action@ad2ddac53f961de1989924296a1f236fcfbaa4fc # v15
+        if: github.repository_owner == 'NixOS'
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci

.github/workflows/nix-parse-v2.yml

@@ -18,14 +18,14 @@ jobs:
     name: nix-files-parseable-check
     runs-on: ubuntu-24.04
     needs: get-merge-commit
-    if: "needs.get-merge-commit.outputs.mergedSha && github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
+    if: "needs.get-merge-commit.outputs.mergedSha && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:
       - name: Get list of changed files from PR
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           gh api \
-            repos/NixOS/nixpkgs/pulls/${{github.event.number}}/files --paginate \
+            repos/${{ github.repository }}/pulls/${{github.event.number}}/files --paginate \
             | jq --raw-output '.[] | select(.status != "removed" and (.filename | endswith(".nix"))) | .filename' \
             > "$HOME/changed_files"
           if [[ -s "$HOME/changed_files" ]]; then