Failure to build the Dockerfile

[GuyKh]

Getting:

...
 => [internal] load build context                                                                                                                                                                                                                                                                                     0.0s
 => => transferring context: 2B                                                                                                                                                                                                                                                                                       0.0s
 => [builder 2/5] WORKDIR /go/src/github.com/maesoser/tplink_exporter                                                                                                                                                                                                                                                 0.7s
 => [builder 3/5] COPY . .                                                                                                                                                                                                                                                                                            0.0s
 => ERROR [builder 4/5] RUN adduser -D tplink && go mod tidy                                                                                                                                                                                                                                                          0.4s
------
 > [builder 4/5] RUN adduser -D tplink && go mod tidy:
#0 0.371 go: go.mod file not found in current directory or any parent directory; see 'go help modules'
------
Dockerfile:6
--------------------
   4 |     WORKDIR $GOPATH/src/github.com/maesoser/tplink_exporter
   5 |     COPY . .
   6 | >>> RUN adduser -D tplink && go mod tidy
   7 |
   8 |     # Compile it
--------------------
ERROR: failed to solve: process "/bin/sh -c adduser -D tplink && go mod tidy" did not complete successfully: exit code: 1

Do you have a working docker container in DockerHub or so?