trimmed extra comments and described two build stages

Dockerfile

@@ -1,20 +1,17 @@
+# build stage
 FROM golang:1.22-alpine AS build
 
-# Set destination for COPY of gui files
 WORKDIR /src
 
 # Download Go modules
 COPY go.mod go.sum ./
 RUN go mod download
 
-# Copy the source code. Note the slash at the end, as explained in
-# https://docs.docker.com/reference/dockerfile/#copy
-# COPY *.go ./
-
-# RUN CGO_ENABLED=0 GOOS=linux go build -o /adonis
+# this could be simplified a lot by being stricter on what we copy.
 COPY . . 
 RUN CGO_ENABLED=0 GOOS=linux go build -o adonis .
 
+# copy only binary and static files to slim image size
 FROM alpine
 
 WORKDIR /app
@@ -22,13 +19,7 @@ WORKDIR /app
 COPY --from=build /src/adonis .
 COPY --from=build /src/static ./static
 
-# Build
-# Optional:
-# To bind to a TCP port, runtime parameters must be supplied to the docker command.
-# But we can document in the Dockerfile what ports
-# the application is going to listen on by default.
-# https://docs.docker.com/reference/dockerfile/#expose
+# application binds to 80 by default
 EXPOSE 80
 
-# Run
 ENTRYPOINT ["/app/adonis"]