Add release workflow and update Makefile

Makefile

@@ -1,4 +1,5 @@
 IMAGE_NAME := tehwey/feedbridge
+VERSION := 0.1.3
 
 all: install
 
@@ -10,13 +11,15 @@ test:
 
 image:
 	docker build -t $(IMAGE_NAME) .
+	docker tag $(IMAGE_NAME):latest $(IMAGE_NAME):$(VERSION)
 
 image-push:
 	docker push $(IMAGE_NAME):latest
+	docker push $(IMAGE_NAME):$(VERSION)
 
-# release:
-# 	git tag -a $(VERSION) -m "Release" || true
-# 	git push origin $(VERSION)
-# 	goreleaser --rm-dist
+release:
+	git tag -a $(VERSION) -m "Release" || true
+	git push origin $(VERSION)
+	goreleaser --rm-dist
 
 .PHONY: install test

docs/Releasing.md

@@ -0,0 +1,13 @@
+# Releasing a new version
+
+For a new release to get pushed to Github and Docker Hub the following steps
+are needed. Set version in `Makefile` and then run the following steps. Make sure
+the Github Token (`GITHUB_TOKEN`) is set for goreleaser.
+
+IMPORTANT: Set version in the Makefile before running this.
+
+```
+feedbridge|master⚡ ⇒ make image
+feedbridge|master⚡ ⇒ make image-push
+feedbridge|master⚡ ⇒ make release
+```