Add an action to automatically generate release PRs (#4306)

* Add an action to automatically generate release PRs

* Add release notes

* PR feedback: error handling

.github/actions/bump-package-versions

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -euo pipefail
+
+version="${1#v}"
+
+files_to_bump=(
+    packages/api/package.json
+    packages/desktop-client/package.json
+    packages/desktop-electron/package.json
+)
+
+for file in "${files_to_bump[@]}"; do
+    if [ -z "$version" ]; then
+        # version format: YY.MM.patch
+        # logic: if before the 25th, bump patch, else set minor/major to next month
+        version="$(jq -r .version "$file" | perl -e '($y,$m,$p)=split/\./,<>;$d=(localtime)[3];$d>25?($p=0,++$m,$m>12&&($m=1,++$y)):$p++;print"$y.$m.$p\n"')"
+        if [ -z "$version" ]; then
+            echo "Error: Failed to calculate new version" >&2
+            exit 1
+        fi
+    fi
+
+    echo "Bumping $file to version $version"
+    jq '.version = "'"$version"'"' "$file" > "$file.tmp"
+    mv "$file.tmp" "$file"
+done

.github/workflows/generate-release-pr.yml

@@ -0,0 +1,35 @@
+name: Generate release PR
+
+on:
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'Commit or branch to release'
+        required: true
+        default: 'master'
+      version:
+        description: 'Version number for the release (optional)'
+        required: false
+        default: ''
+
+jobs:
+  generate-release-pr:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.inputs.ref }}
+      - name: Bump package versions
+        id: bump_package_versions
+        shell: bash
+        run: |
+          .github/actions/bump-package-versions ${{ github.event.inputs.version }}
+          echo "version=$(jq -r .version packages/desktop-client/package.json)" > $GITHUB_OUTPUT
+      - name: Create PR
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: '🔖 (${{ steps.bump_package_versions.outputs.version }})'
+          title: '🔖 (${{ steps.bump_package_versions.outputs.version }})'
+          body: 'Generated by [generate-release-pr.yml](../tree/master/.github/workflows/generate-release-pr.yml)'
+          branch: 'release/v${{ steps.bump_package_versions.outputs.version }}'

upcoming-release-notes/4306.md

@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [jfdoming]
+---
+
+Add an action to automatically generate release PRs