Feature/51 migrate to gha

[emre-f]

The tests that were run through GitHub actions passed. In the subsequent empty commit the caching was also successful.

Note: There was no docker integration step in the travis YAML file, so this workflow only has one job which is the unit test.

[emre-f]

I realized there is a separate issue for adding the docker integration. I will also add them here.

[codecov-commenter]

Codecov Report

Merging #57 (4c9ff20) into develop (809682b) will decrease coverage by 0.16%. The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop      #57      +/-   ##
=============================================
- Coverage      95.99%   95.83%   -0.17%     
+ Complexity       256      255       -1     
=============================================
  Files             32       32              
  Lines            624      624              
  Branches          38       38              
=============================================
- Hits             599      598       -1     
  Misses            19       19              
- Partials           6        7       +1     

Impacted Files	Coverage Δ
...arterkit/drs/utils/hibernate/DrsHibernateUtil.java	82.92% <0.00%> (-2.44%)	:arrow_down:

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[emre-f]

Note: currently only the Unit-Test step is present. The Docker-Integration step will be added in a different PR (see Issue #52 )

[emre-f]

• I have removed the DS_Store files, also added it into the .gitignore file.
• I have removed those test files, you are right they don't work. You will find the new and correct integration test files in the next PR (#58), in this one I am just migrating the Unit-Test.
• I tried manually building the Docker image and it worked. Furthermore, the docker integration tests pass in the next PR, which uses that Dockerfile to build the docker image for testing.