Merge branch 'chore/project-bot-app' into 'main'

ci: use a GitHub App token for the issues board

See merge request deepl-org/deepl/agentic-experience/deepl-cli!1

Author: pkarolyi

.github/workflows/add_issues_to_kanban.yml

@@ -0,0 +1,22 @@
+name: Add issues to the user issues board
+
+on:
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue to project
+    runs-on: ubuntu-latest
+    permissions: {}
+    steps:
+      - uses: actions/create-github-app-token@v3.2.0
+        id: app-token
+        with:
+          client-id: ${{ secrets.PROJECT_BOT_CLIENT_ID }}
+          private-key: ${{ secrets.PROJECT_BOT_PRIVATE_KEY }}
+      - uses: actions/add-to-project@v2.0.0
+        with:
+          project-url: https://github.com/orgs/DeepL/projects/1
+          github-token: ${{ steps.app-token.outputs.token }}