chore(deps): bump dokku/ci-docker-image from 0.15.0 to 0.15.1

Bumps dokku/ci-docker-image from 0.15.0 to 0.15.1.

---
updated-dependencies:
- dependency-name: dokku/ci-docker-image
  dependency-version: 0.15.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -1 +1 @@
-FROM dokku/ci-docker-image:0.15.0
+FROM dokku/ci-docker-image:0.15.1