use jemalloc

dockerfiles/alpine.Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /kubernaut
 
 RUN <<EOT
   apk update -q
-  apk add bash
+  apk add bash jemalloc
   rm -rf /var/cache/apk
   gem update --system --no-document
   gem install -N bundler

dockerfiles/bookworm.Dockerfile

@@ -5,6 +5,7 @@ WORKDIR /kubernaut
 
 RUN <<EOT
   apt-get update -qq
+  apt-get install --yes --no-install-recommends libjemalloc2
   rm -rf /var/lib/apt/lists /var/cache/apt/archives
   gem update --system --no-document
   gem install -N bundler

dockerfiles/entrypoint.sh

@@ -7,4 +7,9 @@ ruby --version
 printf "rubygems %s\n" "$(gem --version)"
 bundle version
 
+if [ -z "${LD_PRELOAD+x}" ]; then
+    LD_PRELOAD="$(find /usr/lib -name libjemalloc.so.2 -print -quit)"
+    export LD_PRELOAD
+fi
+
 exec "${@}"