v0.4.0

Changelog

• Add goreleaser tooling
• CRUD via RESTful interface for satellites
• add generic logging middleware
• better use of chi middleware
• rework URLs to be more restful - #16
• avoid unecessary work in retry loops
• if a satellite has no targets configured, send error upon target retrieval
• if no authorization is configured print a warning to STDOUT
• error handling for dns resolution
• Update pro-bing to 0.4.1
• Proper mutexes around datastructures in head node
• Dockerfile switch to multi-stage. Means much smaller runtime images due to them being based on alpine
• Configuration can be updated at runtime by submitting a configuration through PUT to /config - #27
• Allow to retrieve config via GET to /config
• Clients detects if head node has a new version and terminates itself
• Use constants for header names
• The /healthz endpoint now works if running in 'no database mode'
• Switch gorilla/mux for go-chi/chi5 since gorilla/mux is no longer maintained
• Listen ip and port is now configurable via config file
• If satellite can't submit its data if head node is not reachable the data is now buffered - #1
• Submission of probe results is handled via own go routine - #23