add ci workflow

[ColinChamber]

I suppose that the workflow would help maintainer review pull requests. Checking codecov and Using golangci-lint can also promote the quality of the project.

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@46a2951). Click here to learn what that means. Patch has no changes to coverable lines.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #225 +/- ## ========================================= Coverage ? 32.54% ========================================= Files ? 53 Lines ? 4381 Branches ? 0 ========================================= Hits ? 1426 Misses ? 2800 Partials ? 155 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `32.54% <0.00%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ColinChamber]

preview