add a renovate workflow

.github/workflows/renovate.yaml

@@ -0,0 +1,26 @@
+on: 
+  workflow_call:
+    inputs:
+      author:
+        required: false
+        type: string
+        default: "Renovate <[email protected]>"
+    secrets:
+      token:
+        required: true
+
+jobs:
+  renovate:
+    name: Renovate
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Run Renovate
+        uses: docker://renovate/renovate:latest
+        env:
+          RENOVATE_REPOSITORIES: ${{ github.repository }}
+          RENOVATE_TOKEN: ${{ secrets.token }}
+          RENOVATE_AUTOMERGE: "false"
+          RENOVATE_ONBOARDING: "false"
+          RENOVATE_GIT_AUTHOR: "${{ inputs.author }}"

.github/workflows/renovate_test.yaml

@@ -0,0 +1,7 @@
+on: push
+
+jobs:
+  renovate_test:
+    uses: ./.github/workflows/renovate.yaml
+    secrets:
+      token: "${{ secrets.RENOVATE_TOKEN }}"