Bump plus3it/tardigrade-ci from 0.28.5 to 0.28.6

Bumps plus3it/tardigrade-ci from 0.28.5 to 0.28.6.

---
updated-dependencies:
- dependency-name: plus3it/tardigrade-ci
  dependency-version: 0.28.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1 +1 @@
-FROM plus3it/tardigrade-ci:0.28.5
+FROM plus3it/tardigrade-ci:0.28.6