Update Dockerfile

Dockerfile

@@ -1,5 +1,5 @@
 # Use an official golang runtime as a parent image
-FROM golang:1.16-alpine
+FROM golang:1.16-buster
 
 # Set the working directory in the container to /app
 WORKDIR /app
@@ -7,10 +7,13 @@ WORKDIR /app
 # Copy the local package files to the container's workspace.
 ADD . /app
 
-# Build the chisel command inside the container.
-RUN go get github.com/jpillora/chisel
+# Download and install the chisel package
+RUN go get -v github.com/jpillora/chisel
 RUN go install github.com/jpillora/chisel@latest
 
+# Expose port 8080 for the chisel server
+EXPOSE 8080
+
 # Run the chisel command when the container starts.
 ENTRYPOINT ["chisel"]