Update to Docker Hub automated build

.dockerignore

@@ -0,0 +1,10 @@
+/.env
+/.gitignore
+/Docker*
+/DOCS.md
+/LICENSE
+/logo.svg
+/MAINTAINERS
+/Makefile
+/publish.sh
+/README.md

Dockerfile

@@ -1,6 +1,13 @@
+FROM golang:1.8-alpine as builder
+
+WORKDIR /go/src/drone-email
+COPY . .
+
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build
+
 FROM alpine:3.4
 
 RUN apk add --no-cache ca-certificates
 
-ADD drone-email /bin/
+COPY --from=builder /go/src/drone-email/drone-email /bin/
 ENTRYPOINT ["/bin/drone-email"]

Makefile

@@ -1,4 +1,4 @@
-all: test build publish
+all: test build
 
 test:
 	go vet
@@ -6,7 +6,3 @@ test:
 
 build:
 	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build
-	docker build -t drillster/drone-email:latest .
-
-publish:
-	bash publish.sh

README.md

@@ -18,7 +18,7 @@ go build
 Build the docker image with the following commands:
 
 ```
-make build
+docker build -t drillster/drone-email:latest .
 ```
 
 This will create a Docker image called `drillster/drone-email:latest`.

publish.sh

@@ -1,25 +0,0 @@
-#!/bin/bash
-
-tags=$(git tag --points-at HEAD)
-IFS=$'\n' read -rd '' -a taglist <<<"$tags"
-
-if [ ${#taglist[@]} -gt 0 ]; then
-    echo "Tagging Docker images with: ${taglist[@]}"
-    for tag in "${taglist[@]}"; do
-        docker tag drillster/drone-email:latest drillster/drone-email:$tag
-    done
-fi
-
-echo "Pushing Docker images..."
-docker push drillster/drone-email:latest
-
-if [ "$?" -ne "0" ]; then
-    echo "Failed to push image, exiting!"
-    exit 1
-fi
-
-if [ ${#taglist[@]} -gt 0 ]; then
-    for tag in "${taglist[@]}"; do
-        docker push drillster/drone-email:$tag
-    done
-fi