feat: add tests for linux (#39)

* feat: add dummy test for linux

* feat: add multiple test execution

* fix: update exec of multiple scripts for linux

* fix: execute tests with code from the branch

* fix: fail test exec if at least one test fail

* fix: typo

* wip: test if symlink work

* feat: add new test for check setup of light256 theme

* feat: when theme enabled and not set it default to dark256

* feat: increase tests coverage of checking themes activation

* refactor: rename tests_linux job

* chore: add changelog entry

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added light and dark transparent themes [#18](https://github.com/egel/tmux-gruvbox/issues/18)
 - Added editorconfig
 - Added code linters for shellcheck & shfmt [#33](https://github.com/egel/tmux-gruvbox/issues/33)
+- Added tests (for linux) [#39](https://github.com/egel/tmux-gruvbox/issues/39)
 
 ### Changed