Update buildkite plugin docker-compose to v2.6.0

[renovate]

This PR contains the following updates:

Package	Update	Change	References
docker-compose	minor	v2.5.1 -> v2.6.0	source

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Release Notes

buildkite-plugins/docker-compose-buildkite-plugin

v2.6.0

Compare Source

Added

• Allow multiple cache images for one service (#​171) @​dreyks
• Add use-aliases configuration option (#​182) @​snmaynard
• Add user configuration option (#​183) @​TheDen

Fixed

• Support cache_from directive in composefile 2.2+ (#​163) @​lox
• Move cleanup to a pre-exit hook to cleanup cancelled builds (#​172) @​lox
• Push stderr to log file as well instead of outputting to terminal (#​176) @​GreyKn

Other Changes

• Replace eval with xargs for parsing BUILDKITE_COMMAND (#​165) @​lox
• Update buildkite/plugin-tester:latest Docker digest to 38c4bc (#​168) @​renovate[bot]
• Remove incorrect reference to cleanup function (#​175) @​lox
• Update buildkite plugin shellcheck to v1.1.2 (#​178) @​renovate[bot]
• Use label over name for build step config in examples (#​181) @​petervandoros

Upgrading

To upgrade, update your pipeline.yml files:

steps:
  - command: test.sh
    plugins:
-     docker-compose#v2.5.1:
+     docker-compose#v2.6.0:
        run: app

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