Add initial Dockerfile

.dockerignore

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+.git
+.travis.yml
+Dockerfile

Dockerfile

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+FROM golang:alpine as build
+RUN apk --no-cache --update upgrade && apk --no-cache add git
+
+ADD . /go/src/github.com/mback2k/smtp-dkim-signer
+WORKDIR /go/src/github.com/mback2k/smtp-dkim-signer
+
+RUN go get
+RUN go build -ldflags="-s -w"
+RUN chmod +x smtp-dkim-signer
+
+FROM alpine:latest
+RUN apk --no-cache --update upgrade && apk --no-cache add ca-certificates
+
+COPY --from=build /go/src/github.com/mback2k/smtp-dkim-signer/smtp-dkim-signer /usr/local/bin/smtp-dkim-signer
+
+RUN addgroup -S serve
+RUN adduser -h /data -S -D -G serve serve
+
+WORKDIR /data
+USER serve
+
+CMD [ "/usr/local/bin/smtp-dkim-signer" ]