Build step in make does not work

[spideyz0r]

Hey,

It seems that the problem might be related to govendor and paths.
Do you mind having a look?

Steps to reproduce the issue:

$ git clone https://github.com/newrelic/nri-collectd.git
Cloning into 'nri-collectd'...
remote: Enumerating objects: 765, done.
remote: Total 765 (delta 0), reused 0 (delta 0), pack-reused 765
Receiving objects: 100% (765/765), 2.13 MiB | 4.15 MiB/s, done.
Resolving deltas: 100% (430/430), done.

$ go version
go version go1.16.8 linux/amd64

$ cd nri-collectd/
$ make
go: cannot find main module, but found vendor/vendor.json in ~/nri-collectd
to create a module there, run:
go mod init
=== nri-collectd === [ clean ]: removing binaries and coverage file...
=== nri-collectd === [ validate-deps ]: installing validation dependencies...
get "golang.org/x/lint/golint": found meta tag vcs.metaImport{Prefix:"golang.org/x/lint", VCS:"git", RepoRoot:"https://go.googlesource.com/lint"} at //golang.org/x/lint/golint?go-get=1
get "golang.org/x/lint/golint": verifying non-authoritative meta tag
get "golang.org/x/lint": found meta tag vcs.metaImport{Prefix:"golang.org/x/lint", VCS:"git", RepoRoot:"https://go.googlesource.com/lint"} at //golang.org/x/lint?go-get=1
get "golang.org/x/tools": found meta tag vcs.metaImport{Prefix:"golang.org/x/tools", VCS:"git", RepoRoot:"https://go.googlesource.com/tools"} at //golang.org/x/tools?go-get=1
go: cannot find main module, but found vendor/vendor.json in /nri-collectd
to create a module there, run:
go mod init
=== nri-collectd === [ validate ]: running gofmt... passed.
=== nri-collectd === [ validate ]: running golint... passed.
=== nri-collectd === [ validate ]: running go vet... passed.
=== nri-collectd === [ compile-deps ]: installing build dependencies...
Error: Package "/nri-collectd" not a go package or not in GOPATH.
govendor sync
Ensures the contents of the vendor folder matches the vendor file.
Options:
-n dry run, print out action only
-insecure allow downloading over insecure connection
-v verbose output
make: *** [Makefile:59: compile-deps] Error 2