chore: remove yamllint

[crazy-max]

yamllint was added in #451 to validate our workflows but now GitHub reports YAML syntax issues so let's just remove it.

Signed-off-by: CrazyMax crazy-max@users.noreply.github.com

[thaJeztah]

Does it also report issues with other yaml files? (I see a golang-ci and codecov YAML, so wondering if any of those could potentially have issues that would now be missed)

[crazy-max]

This will be reported by the tool itself like:

#13 ERROR: process "/bin/sh -c golangci-lint run" did not complete successfully: exit code: 3
------
 > [stage-0 5/5] RUN --mount=target=/go/src/github.com/docker/buildx --mount=target=/root/.cache,type=cache   golangci-lint run:
#13 0.530 level=error msg="Can't read config: can't read viper config: While parsing config: yaml: line 12: could not find expected ':'"

[thaJeztah]

Yeah; was wondering if yamllint would provide a more useful / friendly error (and I think it also verifies for "well-formed" / consistent formatting).

[thaJeztah]

LGTM

[tonistiigi]

I think yamlint handles more than just parse errors but also normalizes formatting.