tgui autobuild improvements

.github/workflows/autobuild_tgui.yml

@@ -15,6 +15,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
@@ -26,7 +28,10 @@ jobs:
         run: |
           git config --local user.email "action@github.com"
           git config --local user.name "TGUI"
+          git pull
           git commit -m "Automatic TGUI Rebuild [ci skip]" -a || true
+          git fetch
+          git rebase
       - name: Push Artifacts
         uses: ad-m/github-push-action@master
         with: