added publish step, and drone sig for secrets, plus dockerfile

.drone.yml

@@ -9,8 +9,13 @@ pipeline:
     commands:
       - go test
 
+  publish:
+    image: plugins/docker
+    repo: josebarn/hello-world
+    tags: [ 1.0.0, 1.0, latest ]
+    dockerfile: ./docker/Dockerfile
+    secrets: [ docker_username, docker_password ]
+    
 matrix:
   IMAGE:
-    - golang:1.7
-    - golang:1.8
     - golang:latest

.drone.yml.sig

@@ -0,0 +1 @@
+eyJhbGciOiJIUzI1NiJ9.cGlwZWxpbmU6CiAgYnVpbGQ6CiAgICBpbWFnZTogJHtJTUFHRX0KICAgIGNvbW1hbmRzOgogICAgICAtIGdvIGJ1aWxkCgogIHRlc3Q6CiAgICBpbWFnZTogJHtJTUFHRX0KICAgIGNvbW1hbmRzOgogICAgICAtIGdvIHRlc3QKCiAgcHVibGlzaDoKICAgIGltYWdlOiBwbHVnaW5zL2RvY2tlcgogICAgcmVwbzogam9zZWJhcm4vaGVsbG8td29ybGQKICAgIHRhZ3M6IFsgMS4wLjAsIDEuMCwgbGF0ZXN0IF0KICAgIGRvY2tlcmZpbGU6IC4vZG9ja2VyL0RvY2tlcmZpbGUKICAgIHNlY3JldHM6IFsgZG9ja2VyX3VzZXJuYW1lLCBkb2NrZXJfcGFzc3dvcmQgXQogICAgCm1hdHJpeDoKICBJTUFHRToKICAgIC0gZ29sYW5nOmxhdGVzdAo.35I5ulM7TJbhXqCZsiXBtPAVG0MzsDlsgrl_aZYuK10

docker/Dockerfile

@@ -0,0 +1,23 @@
+# Multi-stage build form
+FROM golang:latest
+
+# Copy in code...
+RUN mkdir /app
+ADD main.go /app/
+
+# Build app
+WORKDIR /app
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o hello .
+
+# Could use something even smaller...
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+
+RUN mkdir /app
+WORKDIR /app/
+COPY --from=0 /app/hello .
+
+# Expose ports for future REST Interface
+EXPOSE 8080
+
+CMD ["/app/hello"]