Enable setting BUILDKITE_GIT_SUBMODULE with Environment Variables#3677

tomowatt wants to merge 7 commits intomainbuildkite/agent:mainfrom

enable-setting-BUILDKITE_GIT_SUBMODULE-env-varsbuildkite/agent:enable-setting-BUILDKITE_GIT_SUBMODULE-env-varsCopy head branch name to clipboard