Add script to repo-sync on local (#55755)

Author: heiskr

package.json

@@ -77,6 +77,7 @@
     "purge-old-workflow-runs": "tsx src/workflows/purge-old-workflow-runs.js",
     "ready-for-docs-review": "tsx src/workflows/ready-for-docs-review.ts",
     "release-banner": "tsx src/ghes-releases/scripts/release-banner.ts",
+    "repo-sync": "./src/workflows/local-repo-sync.sh",
     "reusables": "tsx src/content-render/scripts/reusables-cli.ts",
     "rendered-content-link-checker": "tsx src/links/scripts/rendered-content-link-checker.ts",
     "rendered-content-link-checker-cli": "tsx src/links/scripts/rendered-content-link-checker-cli.ts",

src/workflows/local-repo-sync.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+set -e
+
+echo "> This script assumes docs and docs-internal are cloned together in the same directory already."
+
+echo "> Making sure the repos are a sibiling directories..."
+cd ../docs || (echo "Repo docs not found as a sibling directory" && exit 1)
+cd ../docs-internal || (echo "Repo docs-internal not found as a sibling directory" && exit 1)
+echo "> Found directories for repos docs and docs-internal"
+
+echo "> Checking out main branch and updating both repositories..."
+cd ../docs
+git checkout main
+git pull
+cd ../docs-internal
+git checkout main
+git pull
+echo "> Both repositories are in main and up-to-date"
+
+echo "> Set up remotes if they aren't there..."
+cd ../docs
+git remote show docs-internal || git remote add docs-internal ../docs-internal
+cd ../docs-internal
+git remote show docs || git remote add docs ../docs
+echo "> Remotes set on docs and docs-internal"
+
+echo "> Fetch and merge both repositories..."
+cd ../docs
+git fetch docs-internal main
+git merge docs-internal/main
+cd ../docs-internal
+git fetch docs main
+git merge docs/main
+echo "> Both repositories have each other's latest changes in main"
+
+echo "> Push up both repositories..."
+cd ../docs
+git push --no-verify
+cd ../docs-internal
+git push --no-verify
+echo "> Both repositories are pushed to origin"