Dependency Dashboard

This issue lists Renovate updates and detected dependencies. Read the [Dependency Dashboard](https://docs.renovatebot.com/key-concepts/dashboard/) docs to learn more.
[View this repository on the Mend.io Web Portal](https://developer.mend.io/github/buildkite/ruby-docker-example).

## Config Migration Needed

- [ ] Select this checkbox to let Renovate create an automated Config Migration PR.

## Repository Problems

These problems occurred while renovating this repository. [View logs](https://developer.mend.io//github/buildkite/ruby-docker-example).

- ⚠️ WARN: Detected empty commit - aborting git push

## Other Branches

The following updates are pending. To force the creation of a PR, click on a checkbox below.

- [ ] Update dependency rspec to v3.13.2

## Open

The following updates have all been created. To force a retry/rebase of any, click on a checkbox below.

- [ ] [Update ruby Docker tag to v4](../pull/35)

## Detected Dependencies

buildkite (1)

.buildkite/pipeline.yml (1)

- `docker-compose v5.14.0`

bundler (1)

Gemfile (1)

- `rspec lock file @ 3.4.0` → [Updates: `undefined`]

docker-compose (1)

docker-compose.yml

dockerfile (1)

Dockerfile (1)

- `ruby 2.7-alpine` → [Updates: `4.0-alpine`]

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- [ ] Check this box to trigger a request for Renovate to run again on this repository