ci: add workflow to automatically update next branch (#5921)

* ci: add workflow to automatically update next branch

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

* use environments, use non-deprecated GHA output

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* set write permissions for contents

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Co-authored-by: Jens Langhammer <jens@goauthentik.io>

.github/workflows/release-next-branch.yml

@@ -0,0 +1,25 @@
+name: release-next-branch
+
+on:
+  schedule:
+    - cron: "0 12 * * *" # every day at noon
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  update-next:
+    runs-on: ubuntu-latest
+    environment: internal-production
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: main
+      - id: main-status
+        run: |
+          status=$(curl -fsSL -o head_status.json -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{ github.token}}" "https://api.github.com/repos/${{ github.repository }}/commits/HEAD/status" | jq -r '.status')
+          echo "status=${status}" >> $GITHUB_OUTPUT
+      - if: ${{ steps.main-status.outputs.status == 'success' }}
+        run: |
+          git push origin next --force