Fix ordering of CONFIG arg

docker/Dockerfile

@@ -47,8 +47,6 @@ ARG ARTIFACT_DIR=/web
 
 ARG JELLYFIN_VERSION
 ENV JELLYFIN_VERSION=${JELLYFIN_VERSION}
-ARG CONFIG=Release
-ENV CONFIG=${CONFIG}
 
 RUN apk add \
     autoconf \
@@ -83,6 +81,9 @@ ARG DOTNET_ARCH
 ARG SOURCE_DIR=/src
 ARG ARTIFACT_DIR=/server
 
+ARG CONFIG=Release
+ENV CONFIG=${CONFIG}
+
 WORKDIR ${SOURCE_DIR}
 COPY jellyfin-server .
 ENV DOTNET_CLI_TELEMETRY_OPTOUT=1