chore(release): irtt-server 0.5.2, irtt-rs 0.6.2

irtt-server's hex-pattern chunking moves to the stable as_chunks API
with no behavior change. irtt-rs picks up IRTT_SERVER_* environment
variable configuration, SIGTERM handling via ctrlc's termination
feature, and the Dockerfile/Gitea Actions pipeline that publishes its
server image to Gitea and GHCR.

crates/irtt-app/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "irtt-rs"
-version = "0.6.1"
+version = "0.6.2"
 description = "IRTT-compatible client, TUI, and server applications"
 edition.workspace = true
 license.workspace = true