Switch to github packages for providing docker container.

[github-actions]

Original issue description

Is your feature request related to a problem? Please describe.
Docker hub want organizations to update to a paid business plan.

Describe the solution you'd like
Switch to github packages.

closes #256

[codecov]

Codecov Report

Attention: 88 lines in your changes are missing coverage. Please review.

Comparison is base (33deb56) 83.72% compared to head (21d64f0) 88.30%.
Report is 440 commits behind head on development.

Files	Patch %	Lines
...ager/metastore2/util/MetadataSchemaRecordUtil.java	79.03%	23 Missing and 3 partials ⚠️
...amanager/metastore2/oaipmh/util/OAIPMHBuilder.java	42.50%	8 Missing and 15 partials ⚠️
...er/metastore2/web/impl/FrontendControllerImpl.java	72.22%	5 Missing and 5 partials ⚠️
...atamanager/metastore2/util/MetadataRecordUtil.java	94.65%	6 Missing and 1 partial ⚠️
...va/edu/kit/datamanager/metastore2/Application.java	71.42%	3 Missing and 3 partials ⚠️
.../kit/datamanager/metastore2/util/ActuatorUtil.java	81.81%	4 Missing ⚠️
...ore2/oaipmh/service/MetastoreOAIPMHRepository.java	93.47%	2 Missing and 1 partial ⚠️
...astore2/web/impl/SchemaRegistryControllerImpl.java	94.64%	1 Missing and 2 partials ⚠️
.../metastore2/web/impl/MetadataEditorController.java	33.33%	2 Missing ⚠️
...tore2/oaipmh/service/AbstractOAIPMHRepository.java	66.66%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@                Coverage Diff                @@
##             development     #257      +/-   ##
=================================================
+ Coverage          83.72%   88.30%   +4.58%     
- Complexity           863      929      +66     
=================================================
  Files                 73       74       +1     
  Lines               3201     3326     +125     
  Branches             381      375       -6     
=================================================
+ Hits                2680     2937     +257     
+ Misses               398      263     -135     
- Partials             123      126       +3     

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