Exercise4.01 dockerfile doesn't work with 'latest' tag

As explained in the book, it's best not to use the 'latest' tag. The dockerfile used for exercise 4.01 doesn't work with when you use the 'latest' tag:

# docker build -t welcome:v1 .
Sending build context to Docker daemon  3.072kB
Step 1/5 : FROM golang:latest
latest: Pulling from library/golang
0e29546d541c: Pull complete 
9b829c73b52b: Pull complete 
cb5b7ae36172: Pull complete 
6494e4811622: Pull complete 
6e1d20a8313e: Pull complete 
593823f101dc: Pull complete 
1b4aae56cdbe: Pull complete 
Digest: sha256:c72fa9afc50b3303e8044cf28fb358b48032a548e1825819420fd40155a131cb
Status: Downloaded newer image for golang:latest
 ---> 276895edf967
Step 2/5 : WORKDIR /myapp
 ---> Running in 953c447838bd
Removing intermediate container 953c447838bd
 ---> e14020f0e3c4
Step 3/5 : COPY welcome.go .
 ---> 0b6cd120c7b6
Step 4/5 : RUN go build -o welcome .
 ---> Running in 1ee6f592b952
go: go.mod file not found in current directory or any parent directory; see 'go help modules'
The command '/bin/sh -c go build -o welcome .' returned a non-zero code: 1

I think this is because of changes introduced in version 1.16 of Golang. It works if I use FROM golang:1.15.

PacktWorkshops / The-Docker-Workshop

Exercise4.01 dockerfile doesn't work with 'latest' tag #53