Automate CA certificate bundle update

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/CODEOWNERS

@@ -15,3 +15,5 @@
 /lib/private/Profiler              @CarlSchwan
 /lib/public/Profiler               @CarlSchwan
 
+# Security team
+resources/config/ca-bundle.crt    @ChristophWurst @eneiluj @miaulalala @nickvergessen

.github/workflows/update-cacert-bundle.yml

@@ -0,0 +1,47 @@
+# This workflow is provided via the organization template repository
+#
+# https://github.com/nextcloud/.github
+# https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+
+name: Update CA certificate bundle
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "5 4 * * *"
+
+jobs:
+  update-ca-certificate-bundle:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        branches: ["master", "stable24", "stable23", "stable22"]
+
+    name: update-ca-certificate-bundle-${{ matrix.branches }}
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ matrix.branches }}
+          submodules: true
+
+      - name: Download CA certificate bundle from curl
+        run: curl --etag-compare build/ca-bundle-etag.txt --etag-save build/ca-bundle-etag.txt --output resources/config/ca-bundle.crt https://curl.se/ca/cacert.pem
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.COMMAND_BOT_PAT }}
+          commit-message: Update CA certificate bundle
+          committer: GitHub <noreply@github.com>
+          author: nextcloud-command <nextcloud-command@users.noreply.github.com>
+          signoff: true
+          branch: automated/noid/${{ matrix.branches }}-update-ca-cert-bundle
+          title: "[${{ matrix.branches }}] Update ca-cert bundle"
+          body: |
+            Auto-generated update of CA certificate bundle from [https://curl.se/docs/caextract.html](https://curl.se/docs/caextract.html)
+          labels: |
+            dependencies
+            3. to review

build/ca-bundle-etag.txt

@@ -0,0 +1 @@
+"3650d-5e41fd9674803"