chore(Docker): add docker support

.dockerignore

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+Dockerfile
+.gitignore
+LICENSE.md
+README.md

Dockerfile

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+FROM golang:alpine AS build-base
+
+WORKDIR /tmp/DigitalOceanSnapshotter
+
+COPY go.mod .
+COPY go.sum .
+
+RUN go mod download
+
+COPY cmd ./cmd
+
+RUN go build -o ./out ./cmd/DigitalOceanSnapshotter
+
+FROM alpine:3.9 
+RUN apk add ca-certificates
+
+COPY --from=build-base /tmp/DigitalOceanSnapshotter/out /app/DigitalOceanSnapshotter
+
+RUN ["chmod", "+x", "/app/DigitalOceanSnapshotter"]
+
+CMD ["/app/DigitalOceanSnapshotter"]