Add automation to the release process

CONTRIBUTING.md

@@ -33,6 +33,20 @@ Combinations of these tools can be built into the `RoboFile.php`, e.g. spinning
 
 ## Release Process
 
+### Automated
+1. Merge all production-ready code into `main`.
+2. Run `composer release:pre`. This will prompt for the release number, bump all the versions to that version, and push a new `release-major.minor.patch` version branch.
+3. Create a PR against the `build` branch.
+4. After all tests and code reviews pass (including resolving any merge conflicts) and automation makes the commit containing the build files, merge the PR into `build`.
+5.  Navigate to the [Releases](https://github.com/pantheon-systems/pantheon-wordpress-edge-integrations/releases) page and click the "Draft a New Release" button.
+7. Under "Choose a Tag", enter the release version (`major.minor.patch`) and select "Create a new tag: `major.minor.patch` on publish".
+8. Set the target branch to `build`.
+9. Enter the version number as the release title.
+10. Click the "Auto-generate release notes" button to add the changelog to the release.
+11. Publish the release!
+12. Run `composer release:post`. This will prompt for the current stable release and the next version number and bump the readme to the current stable, and all other versions to the next version. This is intended to be pushed to `main` after the release is published.
+
+### Manual
 1. Merge all production-ready code into `main`.
 2. On your local machine, checkout `main` and pull the latest.
 3. Checkout a new release branch: `git checkout -b release-major.minor.patch` and bump the version number in [pantheon-wordpress-edge-integrations.php](https://github.com/pantheon-systems/pantheon-wordpress-edge-integrations/blob/main/pantheon-wordpress-edge-integrations.php#L7), and [package.json](https://github.com/pantheon-systems/pantheon-wordpress-edge-integrations/blob/main/package.json#L3)

composer.json

@@ -40,9 +40,8 @@
         ]
     },
     "scripts": {
-        "bump:patch": "npm run bump:patch",
-        "bump:minor": "npm run bump:minor",
-        "bump:major": "npm run bump:major",
+        "release:pre": "bash scripts/pre-release",
+        "release:post": "bash scripts/post-release",
         "lint:php": "find ./pantheon-wordpress-edge-integrations.php ./inc ./tests  -name '*.php' -exec php -l {} \\;",
         "lint:phpcs": "vendor/bin/phpcs -s --standard=phpcs.ruleset.xml .",
         "lint:phpcbf": "vendor/bin/phpcbf -s --standard=phpcs.ruleset.xml .",

scripts/post-release

@@ -0,0 +1,28 @@
+#!/bin/bash
+# Announce the script so we know we're in the right place.
+echo "Welcome to the post-release script!
+In this script, we will bump the version number in the plugin file, package.json and the stable version readme."
+
+echo "Enter the current stable release version: "
+read CURRENT_VERSION
+
+echo "Enter the next release version: "
+read NEXT_VERSION
+
+# Check out the main branch and pull the latest changes.
+git checkout main && git pull
+
+# Bump the version in the plugin file.
+sed -i '' "s/Version: .*-dev/Version: $NEXT_VERSION-dev/" pantheon-wordpress-edge-integrations.php
+
+# Bump the version in the readme to the current stable.
+sed -i '' "s/Stable tag: .*/Stable tag: $CURRENT_VERSION  /" README.md
+
+# Bump the versions in the package.json and package-lock.json files.
+node_modules/.bin/bump $NEXT_VERSION package.json package-lock.json
+
+# Commit the changes but don't push.
+git add pantheon-wordpress-edge-integrations.php README.md package.json package-lock.json
+git commit -m "Bump versions to $NEXT_VERSION and current stable $CURRENT_VERSION"
+
+echo "Bumped versions to $NEXT_VERSION and current stable $CURRENT_VERSION. Make sure to push to the main branch."

scripts/pre-release

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Announce the script so we know we're in the right place.
+echo "Welcome to the release prep script!"
+
+# Get the release version.
+echo "Enter the release version: "
+read VERSION
+
+# Make sure we're on the latest version of the working tree and checkout a new release branch.
+git checkout main && git pull
+git checkout -b release-$VERSION
+
+# Drop the -dev in the plugin file.
+sed -i '' "s/Version: .*-dev/Version: $VERSION/" pantheon-wordpress-edge-integrations.php
+
+# Bump the version in the readme.
+sed -i '' "s/Stable tag: .*/Stable tag: $VERSION  /" README.md
+
+# Commit the changes.
+git add pantheon-wordpress-edge-integrations.php README.md
+git commit -m "Bump version to $VERSION"
+git push --set-upstream origin release-$VERSION
+
+echo "Created new release branch for $VERSION. Make sure to set the parent branch to 'build'."