支持设定service name

[socket515]

build时候支持设置service_name，不只是使用可执行文件作为name

1. 补充说明一下这么做的原因，以便评估是否需要
2. build 不是唯一会编译的命令，还有 install/run

抱歉前段时间有点忙，现在才回复。

1. 项目部署的服务的文件名都是一样的，需要指定一个服务名来区分不同的微服务进程
2. 已经在run和intsall补上

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[lyyyuna]

1. 补充说明一下这么做的原因，以便评估是否需要
2. build 不是唯一会编译的命令，还有 install/run

[lyyyuna]

@socket515 下次回复直接加新留言就行，不要 edit，不然没通知。

对于 flag 名字，建议换一个，这个容易引起误解，并且在 help 中说明 flag 未指定时，service 的默认值是什么。

[socket515]

关于flag的名字，profile中也是用service，所以flag使用这个

[CarlJi]

以名字为启动参数的需求

这里能不能补充点详细的信息呢，比如给个例子。@maxiloEmmmm

[maxiloEmmmm]

@CarlJi
没事了 谢谢， 没仔细看代码
v2的extra可以满足 我通过环境变量注入即可

[maxiloEmmmm]

@CarlJi
extra可能会被多个同宿client污染 感觉还是需要service name
例子大概是
switch os.args(0)
case...

[codecov]

Codecov Report

Merging #199 (fb2789e) into master (45aee23) will increase coverage by 2.79%.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
+ Coverage   68.48%   71.27%   +2.79%     
==========================================
  Files          34       34              
  Lines        1745     2012     +267     
==========================================
+ Hits         1195     1434     +239     
- Misses        445      472      +27     
- Partials      105      106       +1     

Flag	Coverage Δ
e2e-1.11.x	∅ <ø> (∅)
e2e-1.12.x	∅ <ø> (∅)
e2e-1.13.x	∅ <ø> (∅)
e2e-1.14.x	∅ <ø> (∅)
e2e-1.15.x	∅ <ø> (∅)
e2e-1.16.x	∅ <ø> (∅)
unittest-1.13.x	71.17% <80.00%> (+2.69%)	⬆️
unittest-1.14.x	71.17% <80.00%> (+2.69%)	⬆️
unittest-1.15.x	71.27% <80.00%> (+2.79%)	⬆️
unittest-1.16.x	71.17% <80.00%> (+2.69%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/run.go	6.12% <0.00%> (+1.24%)	⬆️
pkg/cover/instrument.go	20.83% <ø> (+1.78%)	⬆️
cmd/build.go	67.64% <100.00%> (+4.31%)	⬆️
cmd/commonflags.go	90.90% <100.00%> (-3.04%)	⬇️
cmd/install.go	66.66% <100.00%> (+4.59%)	⬆️
pkg/cover/cover.go	72.15% <100.00%> (+2.53%)	⬆️
pkg/cover/delta.go	87.09% <0.00%> (-2.27%)	⬇️
pkg/build/run.go	0.00% <0.00%> (ø)
pkg/qiniu/mock.go	100.00% <0.00%> (ø)
... and 30 more