Clean up Dockerfile

docker/backend/Dockerfile

@@ -1,6 +1,5 @@
 FROM crystallang/crystal:1.3-alpine as deps
 WORKDIR /app
-RUN apk add curl --no-cache
 COPY ./shard.yml ./shard.lock ./
 RUN shards install --production
 
@@ -9,8 +8,8 @@ ARG BUILD_ENV
 WORKDIR /app/backend
 COPY --from=deps /app/shard.yml /app/shard.lock ./
 COPY --from=deps /app/lib ./lib
-COPY ./Makefile ./Makefile
 COPY ./LICENSE ./LICENSE
+COPY ./Makefile ./Makefile
 COPY ./src ./src
 RUN if [ "${BUILD_ENV}" = "development" ]; then \
   make dev; \