chore: configure Renovate (#19)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

Welcome to [Renovate](https://togithub.com/renovatebot/renovate)! This
is an onboarding PR to help you understand and configure settings before
regular Pull Requests begin.

🚦 To activate Renovate, merge this Pull Request. To disable Renovate,
simply close this Pull Request unmerged.



---
### Detected Package Files

 * `Dockerfile` (dockerfile)
 * `.github/workflows/main.yml` (github-actions)

### Configuration Summary

Based on the default config's presets, Renovate will:

  - Start dependency updates only once this onboarding PR is merged
  - Show all Merge Confidence badges for pull requests.
  - Enable Renovate Dependency Dashboard creation.
- Use semantic commit type `fix` for dependencies and `chore` for all
others if semantic commits are in use.
- Ignore `node_modules`, `bower_components`, `vendor` and various
test/tests directories.
  - Group known monorepo packages together.
  - Use curated list of recommended non-monorepo package groupings.
  - Apply crowd-sourced package replacement rules.
  - Apply crowd-sourced workarounds for known problems with packages.

🔡 Do you want to change how Renovate upgrades your dependencies? Add
your custom config to `renovate.json` in this branch. Renovate will
update the Pull Request description the next time it runs.

---

### What to Expect

With your current configuration, Renovate will create 1 Pull Request:

<details>
<summary>chore(deps): update ghcr.io/splunk/workflow-engine-base docker
tag to v2.0.12</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/ghcr.io-splunk-workflow-engine-base-2.x`
  - Merge into: `main`
  - Upgrade ghcr.io/splunk/workflow-engine-base to `2.0.12`


</details>


---

❓ Got questions? Check out Renovate's
[Docs](https://docs.renovatebot.com/), particularly the Getting Started
section.
If you need any further assistance then you can also [request help
here](https://togithub.com/renovatebot/renovate/discussions).


---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/splunk/wfe-test-runner-action).


<!--renovate-config-hash:e80b4e42a3043bc12fa0640db4bac392d2bf770acf841360d7c8ceeeac2ec1a9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

renovate.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ]
+}