Add pull_upstream github workflow

.github/workflows/pull_upstream.yml

@@ -0,0 +1,42 @@
+name: Sync Upstream
+
+# https://github.com/marketplace/actions/sync-and-merge-upstream-repository-with-your-current-repository
+env:
+  UPSTREAM_URL: "https://github.com/aws/aws-mwaa-local-runner.git"
+  WORKFLOW_TOKEN: ${{ secrets.WORKFLOW_TOKEN }}
+  UPSTREAM_BRANCH: "v2.5.1"
+  # Optional, defaults to UPSTREAM_BRANCH
+  DOWNSTREAM_BRANCH: ""
+  # Optional fetch arguments
+  FETCH_ARGS: ""
+  # Optional merge arguments
+  MERGE_ARGS: ""
+  # Optional push arguments
+  PUSH_ARGS: ""
+  # Optional toggle to spawn time logs (keeps action active) 
+  SPAWN_LOGS: "false" # "true" or "false"
+
+# This runs every day on 1201 UTC
+on:
+  schedule:
+    - cron: '1 12 * * *'
+  # Allows manual workflow run (must be in default branch to work)
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: GitHub Sync to Upstream Repository
+        uses: dabreadman/[email protected]
+        with: 
+          upstream_repo: ${{ env.UPSTREAM_URL }}
+          upstream_branch: ${{ env.UPSTREAM_BRANCH }}
+          downstream_branch: ${{ env.DOWNSTREAM_BRANCH }}
+          token: ${{ env.WORKFLOW_TOKEN }}
+          fetch_args: ${{ env.FETCH_ARGS }}
+          merge_args: ${{ env.MERGE_ARGS }}
+          push_args: ${{ env.PUSH_ARGS }}
+          spawn_logs: ${{ env.SPAWN_LOGS }}
+
+