add Dockerfile, closes #6

Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:alpine AS builder
+
+# Add source code
+ADD ./ /go/src/github.com/dhax/go-base/
+
+RUN cd /go/src/github.com/dhax/go-base && \       
+    go build && \
+    mv ./go-base /usr/bin/go-base
+
+# Multi-Stage production build
+FROM alpine
+
+RUN apk add --update ca-certificates
+
+# Retrieve the binary from the previous stage
+COPY --from=builder /usr/bin/go-base /usr/local/bin/go-base
+
+# Set the binary as the entrypoint of the container
+CMD ["go-base", "serve"]