v0.7.0

Changelog

• 044bc21 Add /healthz endpoint
• ca109f3 Add automated release process via GitHub Actions and goreleaser
• 480f947 Add mqtt publishing
• 84b86f3 Add obis mapping config file
• 7c98f74 Add serial package
• 0ed1b80 Add serverid label
• 7705d59 Fail if mqtt connection can’t be established
• f330c21 Replace shellout to sml_server with go-sml
• b45c030 Update go modules
• dcec9a4 bump to 0.7.0
• b91ec43 initial commit