We need to initialize modules before building

Makefile

@@ -3,7 +3,8 @@ all: mender.conf mender-service
 	mkdir -p /tmp/gocache
 	tar xf mender-2.2.0.tar.gz -C ../go/go/src/github.com/mendersoftware
 	mv ../go/go/src/github.com/mendersoftware/mender-2.2.0 ../go/go/src/github.com/mendersoftware/mender
-	cd ../go/go/src/github.com/mendersoftware/mender && GOCACHE=/tmp/gocache ../../../../bin/go build -ldflags "-X main.Version=2.2.0"
+	cd ../go/go/src/github.com/mendersoftware/mender && GOCACHE=/tmp/gocache GOPATH=$$(pwd)/../../../.. ../../../../bin/go mod init
+	cd ../go/go/src/github.com/mendersoftware/mender && GOCACHE=/tmp/gocache GOPATH=$$(pwd)/../../../.. ../../../../bin/go build -ldflags "-X github.com/mendersoftware/mender/conf.Version=2.2.0"
 	mv ../go/go/src/github.com/mendersoftware/mender/mender /usr/bin/mender
 	mkdir /etc/mender
 	@echo "$$MENDER_CONF" > /etc/mender/mender.conf