chore: kill ssh-agent after deploy

[popomore]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[popomore]

应该是这个问题，分支跑了下能过

Ref #1201

[codecov]

Codecov Report

Merging #1204 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1204   +/-   ##
======================================
  Coverage    99.7%   99.7%           
======================================
  Files          29      29           
  Lines         679     679           
======================================
  Hits          677     677           
  Misses          2       2

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 05f4785...0f153f1. Read the comment docs.

[popomore]

过了，感觉又是 travis 改了啥