add dev guide

Dockerfile

@@ -45,11 +45,7 @@ cp ./target/release/$APP_NAME /bin/server
 # runtime dependencies for the application. This often uses a different base
 # image from the build stage where the necessary files are copied from the build
 # stage.
-#
-# The example below uses the alpine image as the foundation for running the app.
-# By specifying the "3.18" tag, it will use version 3.18 of alpine. If
-# reproducability is important, consider using a digest
-# (e.g., alpine@sha256:664888ac9cfd28068e062c991ebcff4b4c7307dc8dd4df9e728bedde5c449d91).
+
 FROM alpine AS final
 
 # Create a non-privileged user that the app will run under.