Remove .GOPATH symlinks

Simplifies Makefiles to not use `.GOPATH` symlink.
Updates `test.yaml` to reuse the Go cache in between jobs instead of
removing and downloading all the dependencies for every job.

Changelog: other

1 files changed, 5 insertions, 2 deletions

diff --git a/tools.go b/tools.go
index 38b71947..0cc95532 100644
--- a/tools.go
+++ b/tools.go
@@ -2,10 +2,13 @@
 
 package main
 
+// These imports are to force `go mod tidy` not to remove that tools we depend
+// on development. This is explained in great detail in
+// https://marcofranssen.nl/manage-go-tools-via-go-modules/
 import (
-	_ "github.com/fzipp/gocyclo"
+	_ "github.com/golang/mock/mockgen"
+	_ "github.com/golangci/golangci-lint/cmd/golangci-lint"
 	_ "github.com/jstemmer/go-junit-report"
 	_ "github.com/wadey/gocovmerge"
-	_ "golang.org/x/lint/golint"
 	_ "golang.org/x/tools/cmd/goimports"
 )