Remove removed source field in docker volume commands.
@@ -536,7 +536,8 @@ release-binary: $(RELEASE_DIR) versions.mk
-e CGO_ENABLED=0 \
-e GOOS=$(GOOS) \
-e GOARCH=$(GOARCH) \
- -v source=gocache,target=/root/.cache/go-build \
+ --mount=source=gocache,target=/go/pkg/mod \
+ --mount=source=gocache,target=/root/.cache/go-build \
-v "$$(pwd):/workspace$(DOCKER_VOL_OPTS)" \
-w /workspace \
golang:$(GOLANG_VERSION) \
