Add GitHub CI workflow to detect outdated dependencies

Author: hecrj

.github/workflows/detect.yml

@@ -0,0 +1,16 @@
+name: Detect
+on:
+  push: {}
+  pull_request: {}
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  outdated_dependencies:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: hecrj/setup-rust-action@v1
+    - name: Install cargo-outdated
+      run: cargo install cargo-outdated
+    - uses: actions/checkout@master
+    - name: Detect outdated dependencies
+      run: cargo outdated --exit-status 1