Fails to push when /tmp is too small

[eed3si9n]

Steps

Try to push a container larger than /tmp allocation. The Docker images are getting bigger lately, and sometimes we do not control the /tmp allocation in some shared environment.

Problem

It runs out of disk and fails.

Note

There's a default value that's hardcoded to "/tmp/bzl_docker_cache":

rules_minidock/minidock/container_push.bzl

Line 165 in 568a09f

default = "/tmp/bzl_docker_cache",

Expectation

Use somewhere near execroot instead as the default value. In small-/tmp situation, we've already moved Bazel disk cache to somewhere under /home so following execroot should give us a better out-of-box behavior of this rule.