Adding convenience commands to Makefile for building and running dock…

…er image locally (#207)

* Adding convenience commands to Makefile for building and running docker
image locally

* Changing docker make commands to use hyphens instead of underscores to
match existing conventions.
Removed unnecessary docker comment.
Moved .PHONY directives to be colocated to their respective targets for
better maintenance/management.

* Fixing misspelled Make command for `docket-run` to `docker-run`

Makefile

@@ -1,3 +1,6 @@
+GIT_COMMITSHA = $(shell git rev-parse HEAD)
+IMAGE_NAME = "stripemock/stripe-mock"
+
 all: test vet lint check-gofmt
 
 check-gofmt:
@@ -13,3 +16,11 @@ test:
 
 vet:
 	go vet ./...
+
+docker-build:
+	docker build -t "$(IMAGE_NAME):latest" -t "$(IMAGE_NAME):$(GIT_COMMITSHA)" .
+.PHONY: docker-build 
+
+docker-run:
+	docker run --rm -it -p 12111-12112:12111-12112 "$(IMAGE_NAME):latest"
+.PHONY: docker-run