Docker build is not working with current Dockerfile

[vinodrkumars]

Brief summary

I am trying to build docker image using current Dockerfile, build command is failing with following error.

docker build -t xk6-browser . --platform=linux/amd64 --debug

=> ERROR [builder 5/5] RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -o /usr/bin/k6                                    0.1s
 => CACHED [release 2/4] RUN adduser -D -u 12345 -g 12345 k6                                                                           0.0s
------                                                                                                                                      
 > [builder 5/5] RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -o /usr/bin/k6:
0.075 go: go.mod file not found in current directory or any parent directory; see 'go help modules'
------

 3 warnings found (use docker --debug to expand):
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 1)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 9)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 19)
Dockerfile:6
--------------------
   4 |     ARG TARGETOS TARGETARCH
   5 |     RUN apk --no-cache add git=~2
   6 | >>> RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -trimpath -o /usr/bin/k6
   7 |     
   8 |     # Runtime stage
--------------------
ERROR: failed to solve: process "/bin/sh -c CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -trimpath -o /usr/bin/k6" did not complete successfully: exit code: 1

k6 version

latest

OS

macOS

Docker version and image (if applicable)

No response

Steps to reproduce the problem

Using Macbook Pro M4
Trying to build docker image for xk6-browser using Dockerfile from following location https://github.com/grafana/k6/blob/master/Dockerfile

Expected behaviour

docker image should get build successfully.

Actual behaviour

docker build command is failing with following error

=> CACHED [builder 4/5] RUN apk --no-cache add git=~2                                                                                 0.0s
 => ERROR [builder 5/5] RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -trimpath -o /usr/bin/k6                                    0.1s
------                                                                                                                                      
 > [builder 5/5] RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -trimpath -o /usr/bin/k6:
0.082 go: go.mod file not found in current directory or any parent directory; see 'go help modules'