Test workflow: mvn

[MichaelsJP]

Explorative:

• [x] check ors-config.yml discovery without parameter or env variable
  • [x] ./ors-config.yml found
  • [x] ~/.config/openrouteservice/ors-config.yml
  • [x] /etc/openrouteservice/ors-config.yml
  • [x] ~/.config/openrouteservice/ors-config.yml preferred over /etc/openrouteservice/ors-config.yml
  • [x] ./ors-config.yml preferred over ~/.config/openrouteservice/ors-config.yml
• [x] check ors-config.yml discovery with positional parameter
  • [x] custom file loaded
  • [x] custom file loaded if default ors-config.yml is also present
• [x] check ors-config.yml discovery with env variable ORS_CONFIG_LOCATION
  • [x] custom file loaded
  • [x] custom file loaded if default ors-config.yml is also present
• [x] check ors-config.yml discovery with positional parameter AND env variable ORS_CONFIG_LOCATION
  • [x] positional param wins
• [x] check set single configuration property via ENV
• [x] check set single configuration property via program argument
• [x] check set single configuration property via ENV and program argument
  • [x] program argument wins
  • [x] property A set via ENV and property B set via program argument: both survive and override yml
• [ ] check building graphs from custom pbf
• [ ] check documentation

Automation: -> https://github.com/GIScience/openrouteservice/pull/1702