Test sub-split closer on AwsS3V3

bin/close-subsplit-prs.yml

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+---
+name: Close sub-split PRs
+
+on:
+  schedule:
+    - cron: '30 7 * * *'
+
+jobs:
+  close_subsplit_prs:
+    runs-on: ubuntu-latest
+    name: Close sub-split PRs
+    steps:
+      - uses: frankdejonge/[email protected]
+        with:
+          close_pr: 'no'
+          target_branch_match: '^(?!master).+$'
+          message: |
+            Hi :wave:,
+            
+            Thank you for contributing to Flysystem. Unfortunately, you've sent a PR to a read-only sub-split repository. 
+
+            All pull requests should be directed towards: https://github.com/thephpleague/flsysystem

bin/update-subsplit-closers.php

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+<?php
+
+use League\Flysystem\Filesystem;
+use League\Flysystem\Local\LocalFilesystemAdapter;
+
+include __DIR__ . '/../vendor/autoload.php';
+
+$filesystem = new Filesystem(new LocalFilesystemAdapter(realpath(__DIR__ . '/../')));
+$subsplits = json_decode($filesystem->read('config.subsplit-publish.json'), true);
+$workflowContents = $filesystem->read('bin/close-subsplit-prs.yml');
+
+foreach ($subsplits['sub-splits'] as ['directory' => $subsplit]) {
+    if ($subsplit !== 'src/AwsS3V3') {
+        continue;
+    }
+
+    $workflowPath = $subsplit . '/.github/workflows/close-subsplit-prs.yaml';
+    $filesystem->write($workflowPath, $workflowContents);
+}

src/AwsS3V3/.github/workflows/close-subsplit-prs.yaml

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+---
+name: Close sub-split PRs
+
+on:
+  schedule:
+    - cron: '30 7 * * *'
+
+jobs:
+  close_subsplit_prs:
+    runs-on: ubuntu-latest
+    name: Close sub-split PRs
+    steps:
+      - uses: frankdejonge/[email protected]
+        with:
+          close_pr: 'no'
+          target_branch_match: '^(?!master).+$'
+          message: |
+            Hi :wave:,
+            
+            Thank you for contributing to Flysystem. Unfortunately, you've sent a PR to a read-only sub-split repository. 
+
+            All pull requests should be directed towards: https://github.com/thephpleague/flsysystem