feat: run real sync against github test org in tests

Author: mxmehl

.github/workflows/real-test.yaml

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+# SPDX-FileCopyrightText: 2025 DB Systel GmbH
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Test with real GitHub org
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  selftest:
+    runs-on: ubuntu-24.04
+    env:
+      GITHUB_APP_ID: ${{ secrets.TEST_GITHUB_APP_ID }}
+      GITHUB_APP_PRIVATE_KEY: ${{ secrets.TEST_GITHUB_APP_PRIVATE_KEY }}
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: ./.github/actions/poetrybuild
+      - name: Replace data in config files
+        run: |
+          sed -i "s/TEST_GITHUB_ORG/${{ secrets.TEST_GITHUB_ORG }}/g" tests/data/config/org.yaml
+      - name: Make a test dry-run
+        run: poetry run gh-org-mgr sync -c tests/data/config/ --dry -vv

tests/data/config/app.yaml

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+# SPDX-FileCopyrightText: 2024 DB Systel GmbH
+# SPDX-License-Identifier: CC0-1.0
+
+# ------------------------------------------------------------------------------
+# General configuration for this program
+# ------------------------------------------------------------------------------
+
+# github_token: ghp_test
+# github_app_id: 12345
+# github_app_private_key: |
+# ------BEGIN RSA PRIVATE KEY-----
+# ...
+# ------END RSA PRIVATE KEY-----
+
+# Delete teams that are not configured
+delete_unconfigured_teams: true
+
+# Remove members that are not configured
+remove_members_without_team: true

tests/data/config/org.yaml

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+# SPDX-FileCopyrightText: 2025 DB Systel GmbH
+# SPDX-License-Identifier: CC0-1.0
+
+# ------------------------------------------------------------------------------
+# General configuration for the GitHub organisation
+# ------------------------------------------------------------------------------
+
+# Name of the GitHub organisation
+org_name: TEST_GITHUB_ORG
+org_owners:
+  - mxmehl
+
+# Default settings. Will be overridden if set in a team.
+# If neither defaults nor team settings are present:
+# - when creating a new team, will take GitHub's defaults.
+# - when syncing settting of a team, will not touch the current status.
+defaults:
+  team:
+    # Description of a team
+    # description: ""
+    # Level of privacy of a team. Can be "secret" or "closed"
+    privacy: "closed"
+    # Notification setting of a team. Can be "notifications_enabled" or "notifications_disabled"
+    notification_setting: "notifications_enabled"

tests/data/config/teams/testteams.yaml

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+# SPDX-FileCopyrightText: 2025 DB Systel GmbH
+# SPDX-License-Identifier: CC0-1.0
+
+Test1:
+  description: First test team
+  member:
+
+Test2:
+  privacy: secret
+  description: Second test team
+  member: