add new patch release process

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.patches/README.md

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+# Patch Release Process
+
+This directory tracks patches to be applied to the next patch release. It contains a list of patch files of the format `pr-<number>.txt` that define which pull requests should be included in the next patch release, where the content of the file is the description of the fix.
+
+The [sync_patch-release.yml](/.github/workflows/sync_patch-release.yml) workflow will automatically create a "Patch Release" PR with the patches in this directory.
+
+## Usage
+
+To add a PR to the set of patches, run `yarn patch-pr <pr-number> <description>` in the root of the repository.
+
+## GitHub Workflow
+
+A GitHub workflow automatically keeps a "Patch Release" PR in sync with the patches listed in this directory. When you add, modify, or remove patch files, the workflow will:
+
+- Update the existing PR if patch files exist
+- Close and delete the PR branch if no patch files exist

.patches/create-pr-patch.js

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+#!/usr/bin/env node
+
+const fs = require('fs');
+const path = require('path');
+
+const prNumber = process.argv[2];
+const description = process.argv.slice(3).join(' ');
+
+if (!prNumber || !description) {
+  console.error('Usage: yarn patch-pr <pr-number> <description>');
+  process.exit(1);
+}
+
+const patchFilePath = path.join(__dirname, `pr-${prNumber}.txt`);
+fs.writeFileSync(patchFilePath, description);