chore: Use codeowners instead of workflow to assign reviewers

The workflow does not work as it needs a PAT or GitHub App token.
So this will add the teams as code owners to assign people.

By default backend is assigned, but if something below matches it
overwrites the backend assignment, so frontend code will only be
assigned to the frontend team.

Also ensure that for everything there are at least two reviewers.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

.github/CODEOWNERS

@@ -1,3 +1,20 @@
+# Fallback owners for code review - ensure all PRs have someone assigned for review.
+# (the last match will used so this is only used if there is no more specific code owner below)
+
+# Backend
+# is the first and gets everything to make things easier from matching syntax
+*                                             @nextcloud/server-backend
+
+# Frontend
+# this will override the backend code owners if needed
+/__mocks__                                    @nextcloud/server-frontend
+/__tests__                                    @nextcloud/server-frontend
+/cypress                                      @nextcloud/server-frontend
+**/js                                         @nextcloud/server-frontend
+**/src                                        @nextcloud/server-frontend
+*.js                                          @nextcloud/server-frontend
+*.ts                                          @nextcloud/server-frontend
+
 # App maintainers
 /apps/admin_audit/appinfo/info.xml            @luka-nextcloud @blizzz
 /apps/cloud_federation_api/appinfo/info.xml   @mejo-
@@ -34,14 +51,14 @@
 /apps/workflowengine/appinfo/info.xml         @blizzz @juliusknorr
 
 # Frontend expertise
-/apps/files/src*                  @skjnldsv
-/apps/files_external/src*         @skjnldsv
-/apps/files_reminders/src*        @skjnldsv
-/apps/files_sharing/src/actions*  @skjnldsv
-/apps/files_trashbin/src*         @skjnldsv
+/apps/files/src*                    @skjnldsv @nextcloud/server-frontend
+/apps/files_external/src*           @skjnldsv @nextcloud/server-frontend
+/apps/files_reminders/src*          @skjnldsv @nextcloud/server-frontend
+/apps/files_sharing/src/actions*    @skjnldsv @nextcloud/server-frontend
+/apps/files_trashbin/src*           @skjnldsv @nextcloud/server-frontend
 
 # Security team
-/build/psalm-baseline-security.xml  @nickvergessen
+/build/psalm-baseline-security.xml  @nickvergessen @nextcloud/server-backend
 /resources/codesigning              @mgallien @miaulalala @nickvergessen
 /resources/config/ca-bundle.crt     @miaulalala @nickvergessen
 
@@ -53,28 +70,26 @@
 
 # Limit login to IP
 # Watch login routes for https://github.com/nextcloud/limit_login_to_ip
-/core/routes.php	@Altahrim
+/core/routes.php                    @Altahrim @nextcloud/server-backend
 
 # OpenAPI
-openapi*.json           @provokateurin
-ResponseDefinitions.php @provokateurin
+openapi*.json                       @provokateurin
+ResponseDefinitions.php             @provokateurin
 
 # Talk team
-/lib/private/Comments               @nickvergessen
-/lib/private/Federation             @nickvergessen
-/lib/private/Talk                   @nickvergessen
-/lib/public/Comments                @nickvergessen
-/lib/public/Federation              @nickvergessen
-/lib/public/OCM                     @nickvergessen
-/lib/public/Talk                    @nickvergessen
-/lib/public/UserStatus              @nickvergessen
+/lib/private/Comments               @nickvergessen @nextcloud/server-backend
+/lib/private/Federation             @nickvergessen @nextcloud/server-backend
+/lib/private/Talk                   @nickvergessen @nextcloud/server-backend
+/lib/public/Comments                @nickvergessen @nextcloud/server-backend
+/lib/public/Federation              @nickvergessen @nextcloud/server-backend
+/lib/public/OCM                     @nickvergessen @nextcloud/server-backend
+/lib/public/Talk                    @nickvergessen @nextcloud/server-backend
+/lib/public/UserStatus              @nickvergessen @nextcloud/server-backend
 
 # Groupware
 /build/integration/dav_features/caldav.feature    @st3iny @SebastianKrupinski
 /build/integration/dav_features/carddav.feature   @st3iny @SebastianKrupinski
 
 # Personal interest
-*/Activity/*                        @nickvergessen
-*/Notifications/*                   @nickvergessen
-/lib/private/Profiler               @CarlSchwan
-/lib/public/Profiler                @CarlSchwan
+*/Activity/*                        @nickvergessen @nextcloud/server-backend
+*/Notifications/*                   @nickvergessen @nextcloud/server-backend

.github/workflows/request-reviews.yml

@@ -1,78 +0,0 @@
-# SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
-# SPDX-License-Identifier: MIT
-
-name: Assign reviews
-
-on:
-  pull_request:
-    types: [opened, reopened, ready_for_review]
-
-permissions:
-  contents: read
-
-jobs:
-  changes:
-    runs-on: ubuntu-latest-low
-
-    outputs:
-      backend: ${{ steps.changes.outputs.backend }}
-      frontend: ${{ steps.changes.outputs.frontend }}
-
-    steps:
-      - uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
-        id: changes
-        continue-on-error: true
-        with:
-          filters: |
-            backend:
-              - '3rdparty/**'
-              - '**/appinfo/**'
-              - '**/lib/**'
-              - '**/templates/**'
-              - '.php-cs-fixer.dist.php'
-              - 'composer.json'
-              - 'psalm*'
-              - 'build/psalm*'
-              - '**.php'
-            frontend:
-              - 'apps/*/src/**'
-              - 'core/src/**'
-              - 'tsconfig.json'
-              - '**.js'
-              - '**.ts'
-              - '**.vue'
-
-  assign-reviews:
-    name: Assign reviews
-    runs-on: ubuntu-latest-low
-
-    needs: changes
-    # Only if there are not already reviews requested
-    if: github.event.pull_request.requested_reviewers[1] == null
-
-    permissions:
-      pull-requests: write
-
-    steps:
-      - name: Assign backend engineers
-        if: needs.changes.outputs.backend == 'true'
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          gh api \
-            --method POST \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            '/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers' \
-            -f "team_reviewers[]=server-backend"
-      - name: Assign frontend engineers
-        if: needs.changes.outputs.frontend == 'true'
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          gh api \
-            --method POST \
-            -H "Accept: application/vnd.github+json" \
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            '/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers' \
-            -f "team_reviewers[]=server-frontend"