Mount host dir for go build cache in release

Makefile

@@ -51,8 +51,13 @@ docker-run-release: export pkg=/go/src/github.com/databus23/helm-diff
 docker-run-release:
 	git checkout master
 	git push
+	# needed to avoid "failed to initialize build cache at /.cache/go-build: mkdir /.cache: permission denied"
+	mkdir -p docker-run-release-cache
 	# uid needs to be set to avoid "error obtaining VCS status: exit status 128"
-	docker run --user $(shell id -u) -it --rm -e GITHUB_TOKEN -v $(shell pwd):$(pkg) -w $(pkg) golang:1.19.8 make bootstrap release
+	docker run --user $(shell id -u) -it --rm -e GITHUB_TOKEN \
+	-v $(shell pwd):$(pkg) \
+	-v $(shell pwd)/docker-run-release-cache:/.cache \
+	-w $(pkg) golang:1.19.8 make bootstrap release
 
 .PHONY: dist
 dist: export COPYFILE_DISABLE=1 #teach OSX tar to not put ._* files in tar archive