Add Dockerfile

Dockerfile

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+FROM golang:1.15-alpine3.12 as build
+RUN apk add --no-cache git gcc musl-dev sqlite-dev
+ADD *.go /app/
+ADD go.mod /app/
+ADD go.sum /app/
+WORKDIR /app
+RUN go build --tags "libsqlite3 linux"
+
+FROM alpine:3.12
+RUN apk add --no-cache sqlite-dev
+COPY templates/ /app/templates/
+COPY --from=build /app/GoBlog /bin/
+WORKDIR /app
+VOLUME /app/config
+VOLUME /app/data
+EXPOSE 80
+EXPOSE 443
+EXPOSE 8080
+CMD ["GoBlog"]