Enable auto push of docker images (#69)

* Enable auto push of docker images

* Fix Makefile

.travis.yml

@@ -1,4 +1,19 @@
 language: go
 
 go:
-  - 1.13.x
+  - 1.13.x
+
+services:
+  - docker
+
+script:
+  - make
+
+before_deploy:
+  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+
+deploy:
+  provider: script
+  script:  make docker-push
+  on:
+    branch: master

Makefile

@@ -1,4 +1,4 @@
-.PHONY:all run linux docker generate tidy protobuf cover
+.PHONY:all run linux docker generate tidy protobuf cover docker-push
 
 all:
 	go get ./pkg/...
@@ -16,6 +16,10 @@ linux:
 docker:
 	docker build . -t sloop
 
+docker-push: docker
+	docker tag sloop:latest sloopimage/sloop:latest
+	docker push sloopimage/sloop:latest
+
 generate:
 	go generate ./pkg/...