Add merge workflow for XAP branch (#16652)

* Add merge workflow for XAP branch

* uncomment

.github/workflows/develop_update.yml

@@ -5,7 +5,6 @@ on:
     branches:
     - master
 
-
 jobs:
   develop_update:
     runs-on: ubuntu-latest
@@ -22,14 +21,7 @@ jobs:
         git fetch origin master develop
         git checkout develop
 
-    - name: Check if branch locked
-      id: check_locked
-      uses: andstor/file-existence-action@v1
-      with:
-        files: ".locked"
-
     - name: Update develop from master
-      if: steps.check_locked.outputs.files_exists == 'false'
       run: |
         git config --global user.name "QMK Bot"
         git config --global user.email "hello@qmk.fm"

.github/workflows/feature_branch_update.yml

@@ -0,0 +1,34 @@
+name: Update feature branches after develop merge
+
+on:
+  push:
+    branches:
+    - develop
+
+jobs:
+  feature_branch_update:
+    runs-on: ubuntu-latest
+
+    if: github.repository == 'qmk/qmk_firmware'
+
+    strategy:
+      matrix:
+        branch:
+        - xap
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Checkout branch
+      run: |
+        git fetch origin develop ${{ matrix.branch }}
+        git checkout ${{ matrix.branch }}
+
+    - name: Update branch from develop
+      run: |
+        git config --global user.name "QMK Bot"
+        git config --global user.email "hello@qmk.fm"
+        git merge origin/develop
+        git push origin ${{ matrix.branch }}