Migrate to GitHub Actions

[xerial]

• Run cross Scala version tests
• Report Codecov coverage report
• Documentation task
• Snapshot release task on master
• Run the release task on tagged commits
• [ ] Ignore tests if the commit message has "[doc" prefix
• [ ] Ignore tests if the commit message has "[release" prefix

[codecov]

Codecov Report

Merging #744 into master will increase coverage by 1.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #744      +/-   ##
==========================================
+ Coverage   82.52%   83.66%   +1.13%     
==========================================
  Files         217      217              
  Lines        8618     8618              
  Branches      604      617      +13     
==========================================
+ Hits         7112     7210      +98     
+ Misses       1506     1408      -98

Impacted Files	Coverage Δ
...wvlet/airframe/jdbc/PostgreSQLConnectionPool.scala	61.11% <0%> (-38.89%)	⬇️
...ain/scala/wvlet/airframe/jdbc/ConnectionPool.scala	65.51% <0%> (-34.49%)	⬇️
...ala/wvlet/airframe/jdbc/SQLiteConnectionPool.scala	92.3% <0%> (-7.7%)	⬇️
...wvlet/airframe/canvas/DirectByteBufferAccess.scala	71.42% <0%> (+2.38%)	⬆️
...x/src/main/scala/wvlet/airframe/jmx/JMXMBean.scala	70% <0%> (+2.85%)	⬆️
...rframe/msgpack/json/StreamMessagePackBuilder.scala	94.82% <0%> (+5.17%)	⬆️
...rc/main/scala/wvlet/airframe/surface/Surface.scala	80% <0%> (+10%)	⬆️
...json/src/main/scala/wvlet/airframe/json/JSON.scala	72.91% <0%> (+35.41%)	⬆️
...mx/src/main/scala/wvlet/airframe/jmx/JMXUtil.scala	88.88% <0%> (+47.22%)	⬆️
...main/scala/wvlet/airframe/jmx/MBeanParameter.scala	100% <0%> (+50%)	⬆️
... and 3 more

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