Create autoroll.yml

Adding an autoroll github action.  It will run once a day, and create a PR to update DEPS if there are new commits.

.github/workflows/autoroll.yml

diff --git a/.github/workflows/autoroll.yml b/.github/workflows/autoroll.yml
new file mode 100644
index 0000000..62cfc3d
--- /dev/null
+++ b/.github/workflows/autoroll.yml
@@ -0,0 +1,25 @@
+name: Update dependencies
+
+on:
+  schedule:
+    - cron: '0 2 * * *'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      # Checkout the depot tools they are needed by roll_deps.sh
+      - name: Checkout depot tools
+        run: git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+      - name: Update PATH
+        run: echo "./depot_tools" >> $GITHUB_PATH
+      - name: Download dependencies
+        run: python3 utils/git-sync-deps
+      - name: Update dependencies
+        run: python3 utils/roll_deps.sh
+#      - name: create new 
+#        run: gh pr create ...
+