allow to rename hook dir name

[shivamka1]

Allow to rename the default hook directory name from git-hooks to .githooks or make .githooks as default for the sake for convention.

[Eli-Golin]

In theory it should be possible by overriding the hooksSourceDir setting key, but I am afraid it doesn't have any effect. I tried myself overriding the gitHooksDir setting key in order to adopt the plugin to git with sub-modules, but sbt warns me that this key is not used. Very strange.

[aartajew]

You can override default plugin settings in build.sbt file with i.e.:

Seq(GitHooks.globalSettings *)
gitHooksDir := Some(file("../.git/hooks"))

If you want to write hooks on each compile use:

(Compile / compile) := ((Compile / compile) dependsOn writeHooks).value