https://hub.docker.com/repository/docker/goosys/jemalloc-ruby/general

Dockerfile

FROM ruby:3.1-slim-bookworm as jemalloc

RUN apt-get update
RUN apt-get install -y wget
RUN apt-get install -y build-essential

RUN wget -O - https://github.com/jemalloc/jemalloc/releases/download/5.3.0/jemalloc-5.3.0.tar.bz2 | tar -xj && \
    cd jemalloc-5.3.0 && \
    ./configure && \
    make && \
    make install

FROM ruby:3.1-slim-bookworm
COPY --from=jemalloc /usr/local/lib/libjemalloc.so.2 /usr/local/lib/

Dockerfile2

FROM ruby:2.7.2-alpine as jemalloc

RUN apk add build-base

RUN wget -O - https://github.com/jemalloc/jemalloc/releases/download/5.2.1/jemalloc-5.2.1.tar.bz2 | tar -xj && \
    cd jemalloc-5.2.1 && \
    ./configure && \
    make && \
    make install

FROM ruby:2.7.2-alpine
COPY --from=jemalloc /usr/local/lib/libjemalloc.so.2 /usr/local/lib/