Introducing FlyDeploy for Seamless Hot Code Upgrades in Elixir

FlyDeploy is an Elixir package that allows developers to perform hot code upgrades on their Elixir and Phoenix applications. This feature is crucial for maintaining websocket connections and ensuring stateful applications do not require restarts when deploying changes. FlyDeploy operates similarly to Erlang's release handler, enabling processes with updated code to be temporarily suspended for an upgrade and then resumed without losing state. For Phoenix LiveView applications, it automatically updates the UI for users in real-time. To use FlyDeploy, developers build a new container image without deploying it and then execute a command to perform the hot upgrade using existing architecture. This library allows for easier handling of everyday code changes while still providing a fallback to traditional deployment methods if necessary. The content includes a detailed technical overview and example usage, making it a valuable resource for Elixir developers looking to implement hot code upgrades effectively.