add test for implicit creation of a fork in an organization

tests/origin-organization-fork-destination/.forgejo/workflows/test.yml

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+# SPDX-License-Identifier: MIT
+name: test
+on:
+  pull_request_target:
+    types:
+      - opened
+      - synchronize
+      - closed
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: SELF@vTest
+        with:
+          origin-url: ${{ env.GITHUB_SERVER_URL }}
+          origin-repo: user1/origin-organization-fork-destination
+          origin-token: ${{ secrets.ORIGIN_TOKEN }}
+          origin-pr: ${{ github.event.pull_request.number }}
+          destination-url: ${{ env.GITHUB_SERVER_URL }}
+          destination-repo: user2/destinationrepo
+          destination-fork-repo: destination-fork/destinationrepo
+          destination-branch: main
+          destination-token: ${{ secrets.DESTINATION_TOKEN }}
+          update: ./upgraded
+          debug: true

tests/origin-organization-fork-destination/README

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+originrepo

tests/origin-organization-fork-destination/upgraded

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+#!/bin/bash
+
+set -ex
+
+destination_checkout="$1"
+destination_pr_json="$2"
+origin_checkout="$3"
+origin_pr_json="$4"
+
+test -d $destination_checkout
+test -d $origin_checkout
+test -f $origin_pr_json
+
+date +%s > $destination_checkout/last