Added Docker fixes issue #5

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:alpine AS build-env
+ADD . /src
+RUN cd /src && go build -o wakapi
+
+# final stage
+FROM alpine
+WORKDIR /app
+COPY --from=build-env /src/wakapi /app/
+COPY --from=build-env /src/config.ini /app/
+COPY --from=build-env /src/.env.example /app/.env
+RUN sed -i 's/listen = 127.0.0.1/listen = 0.0.0.0/g' /app/config.ini
+ADD static /app/static
+ADD wait-for-it.sh .
+ENTRYPOINT ./wait-for-it.sh