chore(ci): use tfvargen image directly from docker hub

Author: hanks

.travis.yml

@@ -3,7 +3,5 @@ services:
   - docker
 notifications:
   email: false
-before_install:
-  - make dev
 script:
   - make test

Makefile

@@ -4,16 +4,13 @@ WORKSPACE = /go/src/github.com/hanks/terraform-variables-generator
 DEV_IMAGE = hanks/tfvargen-dev:1.0.0
 OS = $(shell uname -s | tr '[:upper:]' '[:lower:]')
 
-.PHONY: dev pull push build test debug install uninstall clean
+.PHONY: dev push build test debug install uninstall clean
 
-default: pull
+default: test
 
 dev:
 	docker build -t $(DEV_IMAGE) .
 
-pull:
-	docker pull $(DEV_IMAGE)
-
 push:
 	docker push $(DEV_IMAGE)
 

README.md

@@ -180,8 +180,7 @@ variable "tags" {
 
 ## Development
 
-* `make pull`, pull `tfvargen-dev` docker image for development, should be run before other commands
-* `make dev`, build docker image used in dev
 * `make test`, run unit test, coverage test, static analytics
 * `make build`, cross compile binaries, and put into `dist/bin` directory
 * `make debug`, use `dlv` to do the `gdb-style` debug
+* `make dev`, build docker image used in dev