fix: set --jobs in the main Dockerfile

Dockerfile

@@ -2,7 +2,7 @@ FROM rust:1.66.1-alpine3.17 as builder
 WORKDIR /src
 RUN apk update && apk add --no-cache gcc musl-dev
 COPY ./ .
-RUN cargo build --release
+RUN cargo build --release --jobs 2
 
 FROM alpine:3.17.1
 COPY --from=builder /src/target/release/cdh /bin/cdh