add docker-compose / make based CI

[gesinn-it-evl]

This PR is made in reference to: nothing

This PR addresses or contains:

• docker-compose based CI
• test-coverage script in composer.json
• github-action (ci.yml) that runs phpunit

This PR includes:

• Tests (unit/integration)
• CI build passed

[codecov-commenter]

Codecov Report

Merging #789 (584e1b4) into master (71822ed) will increase coverage by 0.18%.
Report is 65 commits behind head on master.
The diff coverage is 42.65%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@             Coverage Diff              @@
##             master     #789      +/-   ##
============================================
+ Coverage     40.35%   40.54%   +0.18%     
- Complexity     2061     2323     +262     
============================================
  Files            75       78       +3     
  Lines          7268     8231     +963     
============================================
+ Hits           2933     3337     +404     
- Misses         4335     4894     +559     

Files	Coverage Δ
SemanticResultFormats.hooks.php	0.00% <ø> (ø)
formats/filtered/src/Filtered.php	93.90% <100.00%> (+0.07%)	⬆️
formats/gallery/Gallery.php	94.88% <100.00%> (ø)
formats/slideshow/SRF_SlideShow.php	0.00% <ø> (ø)
src/Graph/GraphOptions.php	95.45% <100.00%> (ø)
formats/datatables/Hooks.php	96.87% <96.87%> (ø)
src/ResourceFormatter.php	97.43% <90.00%> (-2.57%)	⬇️
formats/jqplot/SRF_jqPlot.php	0.00% <0.00%> (ø)
formats/carousel/Carousel.php	91.27% <91.27%> (ø)
formats/datatables/Api.php	0.00% <0.00%> (ø)
... and 1 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[JeroenDeDauw]

Now the tests on master fail. Better to either remove the 1.40 tests or to make them optional