Pin dev go version to 1.17.8

Changzheng Liurequested to merge
99-cz-go-1-17.8 into main

#99 (closed) was opened to upgrade the go version. I think the root problem will be addressed by gitlab-omnibus-builder#47 (closed). I am creating this MR to

  • Pin dev go version to 1.17.8
  • Support go 1.17 compatible features by changing go directive in go.mod file.

Closes #99 (closed)

Edited by Changzheng Liu

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