Run commands with a specific golang version

Merge pull request #40 from buildkite-plugins/SUP-690

Passed in 1m 13s
:pipeline:buildkite-agent pipeline upload
Waited 4s
·
Ran in 3s
run bats tests
Waited 9s
·
Ran in 6s
:bash: Shellcheck
Waited 8s
·
Ran in 3s
Linter
Waited 9s
·
Ran in 15s
test running a specific versiongo version
Waited 12s
·
Ran in 22s
test cross compilinggo build ./tests/helloworld
Waited 40s
·
Ran in 31s
Total Job Run Time: 1m 20s