Github actions, problem with dep installing - go

Question

I have this go.yml for github actions
name: Test
on: [push, pull_request]
jobs:
build:
name: Build
runs-on: ubuntu-latest
steps:
- name: Set up Go 1.15
uses: actions/setup-go#v2
with:
go-version: 1.15
id: go
- name: Check out code
uses: actions/checkout#v2
- name: Get dependencies
run: |
if [ -f Gopkg.toml ]; then
curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
dep ensure
fi
- name: Build
run: go build -v ./...
- name: Test
run: go test -v ./...
It builds with error: home/runner/work/project/project is not within a known GOPATH/src
Error: Process completed with exit code 1.
How to fix it problem?

Answer 1

The default value of GOPATH is $HOME/go.
Your project folder is outside of this GOPATH hence the error.
You have two ways to fix this problem.
(Preferred) Update your project to use go.mod. It's the newer, nicer dependency management solution in go and doesn't require your project to be in GOPATH.
Assuming you are using Go version newer than 1.12, Remove the Gopkg.toml and Gopkg.lock (if you have it).
Run,
a. go mod init <project-name> Replace <project-name> with the name of your project.
b. Run go mod tidy and it'll add all the dependencies you are using in your project.
c. Run go build once to make sure your project still builds. If it doesn't, You can add the missing dependencies manually in go.mod.
Commit go.mod and go.sum(if you need deterministic builds).
Removed this from your CI config,
if [ -f Gopkg.toml ]; then
curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
dep ensure
fi
and just build the project. It should work.
Set the GOPATH correctly in your CI config before calling dep ensure. I think GOPATH=/home/runner/work/project/project should work but I am not aware of the exact specifics related to GOPATH so you'll just have to try.