build: replace gofmt with goimports

goimports formats the import lines and also formats the code style
as per gofmt so now `make fmt` will fix both

this usefull in the absence of a full ide with golang support

Makefile

@@ -249,8 +249,8 @@ e2e-story-registry: install
 
 
 .PHONY: fmt
-fmt:
-	@gofmt -l -w $(SOURCE_DIRS)
+fmt: $(TOOLS_BINDIR)/goimports
+	@$(TOOLS_BINDIR)/goimports -l -w $(SOURCE_DIRS)
 
 # Run golangci-lint against code
 .PHONY: lint cross-lint

tools/bin/.gitignore

@@ -3,3 +3,5 @@ golangci-lint.exe
 gomod2rpmdeps
 makefat
 mockery
+goimports
+goimports.exe

tools/dummy.go

@@ -7,4 +7,5 @@ import (
 	_ "github.com/cfergeau/gomod2rpmdeps/cmd/gomod2rpmdeps"
 	_ "github.com/golangci/golangci-lint/cmd/golangci-lint"
 	_ "github.com/randall77/makefat"
+	_ "golang.org/x/tools/cmd/goimports"
 )

tools/go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/cfergeau/gomod2rpmdeps v0.0.0-20210223144124-2042c4850ca8
 	github.com/golangci/golangci-lint v1.51.2
 	github.com/randall77/makefat v0.0.0-20210315173500-7ddd0e42c844
+	golang.org/x/tools v0.6.0
 )
 
 require (
@@ -171,7 +172,6 @@ require (
 	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.5.0 // indirect
 	golang.org/x/text v0.7.0 // indirect
-	golang.org/x/tools v0.6.0 // indirect
 	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

tools/tools.mk

@@ -11,3 +11,6 @@ $(TOOLS_BINDIR)/gomod2rpmdeps: $(TOOLS_DIR)/go.mod
 
 $(TOOLS_BINDIR)/mockery: $(TOOLS_DIR)/go.mod
 	cd $(TOOLS_DIR) && GOBIN="$(TOOLS_BINDIR)" go install github.com/vektra/mockery/v2@latest
+
+$(TOOLS_BINDIR)/goimports: $(TOOLS_DIR)/go.mod
+	cd $(TOOLS_DIR) && GOBIN="$(TOOLS_BINDIR)" go install golang.org/x/tools/cmd/goimports@latest