Merge before update to step 5 (#57)

* Create a script to merge branches

Run the script to avoid conflicts

* Correct the script path

* Delete the instruction to resolve conflicts

Now the conflicts are avoided!

.github/script/merge-branch.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Make sure this file is executable
+# chmod +x .github/script/merge-branch.sh
+
+# USAGE: This script is used to merge a branch into another branch
+
+# BACKGROUND: This operation is required to avoid conflicts between branches.
+
+# Setup commiter identity
+git config user.name github-actions
+git config user.email [email protected]
+
+# Merge branch
+echo "If branch $branch2 exists, merge branch origin $branch1 into branch $branch2"
+if git show-ref --quiet refs/heads/$branch2
+then
+  git checkout $branch2
+  git merge origin $branch1
+  git push origin $branch2
+else
+  echo "Branch $branch2 does not exist"
+fi

.github/steps/5-merge-your-pull-request.md

@@ -13,6 +13,5 @@ You can now [merge](https://docs.github.com/get-started/quickstart/github-glossa
 ### :keyboard: Activity: Merge your pull request
 
 1. Go to the **Pull requests** tab.
-1. Resolve any merge conflicts. <!-- TODO: figure out a better way to deal with the merge conflicts. -->
 1. Click **Merge pull request**.
 1. _Once you turn on branch protection, Actions can no longer push directly to the `main` branch. Make sure that you're on the `ci` branch in the page you're following instructions from._ Wait about 20 seconds and then refresh the page. [GitHub Actions](https://docs.github.com/actions) will automatically update to the next step.

.github/workflows/4-add-branch-protections.yml

@@ -56,6 +56,11 @@ jobs:
           fetch-depth: 0 # Let's get all the branches.
           ref: ci # Important, as normally `branch_protection_rule` event won't grab other branches
 
+      - name: Merge changes from origin main into ci
+        run: ./.github/script/merge-branch.sh
+        env:
+          branch1: main
+          branch2: ci
 
       # TODO: figure out a better way to deal with the merge conflict.
       # In README.md, switch step 4 for step 5.