Create main.yml

.github/workflows/main.yml

@@ -0,0 +1,29 @@
+# .github/workflows/example.yml
+
+name: Merge upstream branches
+on:
+  workflow_dispatch:
+  schedule:
+     # actually, ~5 minutes is the highest
+     # effective frequency you will get
+    - cron:  '0 * * * *'
+jobs:
+  merge:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Merge upstream
+        run: |
+          git config --global user.name 'bot'
+          git config --global user.email 'bot@noreply.com'
+          
+          # "git checkout master" is unnecessary, already here by default
+          git pull --unshallow  # this option is very important, you would get
+                                # complains about unrelated histories without it.
+                                # (but actions/checkout@v2 can also be instructed
+                                # to fetch all git depth right from the start)
+          git remote add upstream https://github.com/microsoft/fluentui-system-icons.git
+          git fetch --all
+          git checkout master
+          git pull --rebase upstream master
+          git push -f origin master