ci: bump Sage

.sage/go.mod

@@ -2,4 +2,4 @@ module sage
 
 go 1.17
 
-require go.einride.tech/sage v0.128.0
+require go.einride.tech/sage v0.159.0

.sage/go.sum

@@ -1,2 +1,2 @@
-go.einride.tech/sage v0.128.0 h1:Oh0bUf5sYJ56ujmBORj2b/js8YnXVtzVW54RQXgTRr8=
-go.einride.tech/sage v0.128.0/go.mod h1:EzV5uciFX7/2ho8EKB5K9JghOfXIxlzs694b+Tkl5GQ=
+go.einride.tech/sage v0.159.0 h1:sRcbZnIVS27HIZUuARkQp9gOeTF2j1957MtzD+P9zx8=
+go.einride.tech/sage v0.159.0/go.mod h1:EzV5uciFX7/2ho8EKB5K9JghOfXIxlzs694b+Tkl5GQ=

Makefile

@@ -3,19 +3,41 @@
 
 .DEFAULT_GOAL := all
 
-sagefile := .sage/bin/sagefile
-
-$(sagefile): .sage/go.mod .sage/*.go
-	@cd .sage && go mod tidy && go run .
+cwd := $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+sagefile := $(abspath $(cwd)/.sage/bin/sagefile)
+
+# Setup Go.
+go := $(shell command -v go 2>/dev/null)
+export GOWORK ?= off
+ifndef go
+SAGE_GO_VERSION ?= 1.18.4
+export GOROOT := $(abspath $(cwd)/.sage/tools/go/$(SAGE_GO_VERSION)/go)
+export PATH := $(PATH):$(GOROOT)/bin
+go := $(GOROOT)/bin/go
+os := $(shell uname | tr '[:upper:]' '[:lower:]')
+arch := $(shell uname -m)
+ifeq ($(arch),x86_64)
+arch := amd64
+endif
+$(go):
+	$(info installing Go $(SAGE_GO_VERSION)...)
+	@mkdir -p $(dir $(GOROOT))
+	@curl -sSL https://go.dev/dl/go$(SAGE_GO_VERSION).$(os)-$(arch).tar.gz | tar xz -C $(dir $(GOROOT))
+	@touch $(GOROOT)/go.mod
+	@chmod +x $(go)
+endif
+
+.PHONY: $(sagefile)
+$(sagefile): $(go)
+	@cd .sage && $(go) mod tidy && $(go) run .
 
 .PHONY: sage
 sage:
-	@git clean -fxq $(sagefile)
 	@$(MAKE) $(sagefile)
 
 .PHONY: update-sage
-update-sage:
-	@cd .sage && go get -d go.einride.tech/sage@latest && go mod tidy && go run .
+update-sage: $(go)
+	@cd .sage && $(go) get -d go.einride.tech/sage@latest && $(go) mod tidy && $(go) run .
 
 .PHONY: clean-sage
 clean-sage: