Adds docker container

.dockerignore

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+Dockerfile
+tmp/
+vendor/
+data/

.gitignore

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+data/

Dockerfile

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+
+ARG GO_VERSION=1.12
+FROM golang:${GO_VERSION}-alpine AS builder
+
+RUN apk add --no-cache ca-certificates git gcc libc-dev && \
+        mkdir -p /build/etc/ssl/certs && \
+        cp /etc/ssl/certs/ca-certificates.crt /build/etc/ssl/certs/ && \
+        echo 'app:x:2000:2000::/:' > /build/etc/passwd && \
+        echo 'app:x:2000:' > /build/etc/group 
+
+WORKDIR /src
+COPY . .
+RUN go mod download
+RUN go build -o /build/app cmd/server/server.go
+
+################################################################################
+
+# alpine required because the built app depends on some dynamicly linked lib,
+# thanks to not being able to build without CGO which the sqlite3 pkg depends on
+FROM alpine:3.9 AS final
+#FROM scratch AS final
+
+COPY --from=builder --chown=2000:2000 /build /
+
+USER 2000:2000
+ENV HOME /data
+WORKDIR $HOME
+VOLUME $HOME
+EXPOSE 8082
+
+CMD ["/app", "-addr=:8082", "-path=/data/servers.db"]