Test

Update and rename go.yml to tests.yml #1

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6 errors

Error return value of `io.CopyN` is not checked (errcheck)

S1025: the argument's underlying type is a slice of bytes, should use a simple conversion instead of fmt.Sprintf (gosimple)

S1020: when ok is true, v can't be nil (gosimple)

S1011: should replace loop with `opt.AdditionalFields = append(opt.AdditionalFields, AdditionalFields...)` (gosimple)

SA5008: unknown JSON option "omitempt" (staticcheck)

issues found