release: Containerized release process

Makefile

@@ -36,6 +36,13 @@ ifndef HAS_GLIDE
 endif
 	glide install --strip-vendor
 
+.PHONY: docker-run-release
+docker-run-release: export pkg=/go/src/github.com/databus23/helm-diff
+docker-run-release:
+	git checkout master
+	git push
+	docker run -it --rm -e GITHUB_TOKEN -v $(shell pwd):$(pkg) -w $(pkg) golang:1.12.5 make bootstrap release
+
 .PHONY: dist
 dist: export COPYFILE_DISABLE=1 #teach OSX tar to not put ._* files in tar archive
 dist:
@@ -57,5 +64,4 @@ release: dist
 ifndef GITHUB_TOKEN
 	$(error GITHUB_TOKEN is undefined)
 endif
-	git push
-	github-release databus23/helm-diff v$(VERSION) master "v$(VERSION)" "release/*"
+	scripts/release.sh v$(VERSION) master

README.md

@@ -229,3 +229,11 @@ To run all tests:
 ```
 go test -v ./...
 ```
+
+## Release
+
+Set `GITHUB_TOKEN` and run:
+
+```
+$ make docker-run-release
+```

scripts/release.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+go get github.com/aktau/github-release
+
+user=databus23
+repo=helm-diff
+tag=$1
+commit=$2
+
+github-release release -u $user -r $repo -t $tag -c $commit -n $tag
+
+for f in $(ls release); do
+  github-release upload -u $user -r $repo -t $tag -n $f -f release/$f
+done