⬆️ docker: adds dockerfile.

Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.12 as build-env
+ADD . /opt/gaurun
+RUN cd /opt/gaurun/cmd/gaurun &&\
+    go build -tags=internal -a -ldflags="-s -w -linkmode external -extldflags -static" -v  &&\
+    cd /opt/gaurun/cmd/gaurun_recover &&\
+    go build -tags=internal -a -ldflags="-s -w -linkmode external -extldflags -static" -v
+
+FROM alpine:latest
+RUN apk add --no-cache ca-certificates tzdata &&\
+    addgroup -g 1000 -S gaurun &&\
+    adduser -u 1000 -S gaurun -G gaurun
+COPY --from=build-env /opt/gaurun/cmd/gaurun/gaurun /app/
+COPY --from=build-env /opt/gaurun/cmd/gaurun_recover/gaurun_recover /app/
+COPY ./conf/gaurun.toml /app/conf/gaurun.toml
+USER gaurun
+WORKDIR /app
+EXPOSE 1056
+CMD ["./gaurun", "-c", "conf/gaurun.toml"]