docker: bump atc0005/go-ci from go-ci-oldstable-build-v0.14.9 to go-ci-oldstable-build-v0.15.0 in /dependabot/docker/builds #174

Job	Run time
Makefile / Assert PR branch is ahead	6s
CI matrix / Assert PR branch is ahead	5s
CI matrix / Lint codebase (go-ci-oldstable, false)	25s
CI matrix / Lint codebase (go-ci-stable, false)	24s
CI matrix / Lint codebase (go-ci-unstable, true)	22s
CI matrix / Build codebase (go-ci-oldstable, false)	21s
CI matrix / Run tests (go-ci-oldstable, false)	28s
CI matrix / Build codebase (go-ci-stable, false)	27s
CI matrix / Run tests (go-ci-stable, false)	21s
Makefile / Build codebase using Makefile quick recipe	29s
CI matrix / Build codebase (go-ci-unstable, true)	26s
CI matrix / Run tests (go-ci-unstable, true)	32s
Makefile / Build codebase using Makefile all recipe	0s
Makefile / Lint codebase using Makefile	0s
CI matrix / Optional Linting / Assert PR branch is ahead	6s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-oldstable, true)	20s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	22s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	27s
	5m 41s

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