v0.3.0

Changelog

• b582e51 Add debug logging for client connection accounting
• 707b956 Add modbus message reader
• 053534c Add some bookkeeping to only keep the target connection open as long as there are connected clients.
• 22202ed Fix typo
• c0087c3 Push multi-platform images to GitHub Container Registry
• f33400f Remove container signing
• 55addf6 Reuse response channel per connection
• 6271486 automate unit test