GitHub build ci

[findNextStep]

add github ci integrated

include

• build in macos/linux-ubuntu
• clang-format check for all code under src floder

I format some code for clang-format ci check

[findNextStep]

for issue https://github.com/MaskRay/ccls/issues/534

[XVilka]

Would be nice to run the tests too.

[findNextStep]

Would be nice to run the tests too.

test-index in ccls seem to need clang-6 but I can`t work out with mac, can you help with that?

[XVilka]

Will check later, yes

[findNextStep]

Please also correct commit message from "add github ci integrated" to something more verbose like:

Add github CI integration.

CI will be responsible for compiling source code and code formatting.

all suggest has accepted

[Trass3r]

Imo you should do Release builds instead to be able to publish them.

[xerrni]

@Trass3r @findNextStep CI should create both as it is a good practice especially for c/c++ projects where depending on build type different macros / defines etc. will be used.

[Endle]

How about adding a basic Github CI at the beginning, and try to add further CI workflows in further PRs?

IHMO a working CI could not only run unit tests, but also be an example of how to build and install this project, as a supplement of the docs.

I'd like to take over this PR if it has been stalled