feat: allow optional use of jemalloc

via USE_JEMALLOC which defaults to false

Closes #1100

(cherry picked from commit 0ba6603)

Dockerfile

@@ -2,16 +2,18 @@ FROM pypy:2-5.9.0
 
 RUN mkdir -p /app
 ADD . /app
+RUN chmod +x /app/entrypoint.sh
 
 WORKDIR /app
 ENV PATH=$PATH:/root/.cargo/bin
 
 RUN \
     apt-get update && \
-    apt-get install -y -qq libexpat1-dev gcc libssl-dev libffi-dev && \
+    apt-get install -y -qq libexpat1-dev gcc libssl-dev libffi-dev libjemalloc1 && \
     curl https://sh.rustup.rs | sh -s -- -y && \
     make clean && \
     pip install -r requirements.txt && \
     pypy setup.py develop
 
+ENTRYPOINT ["/app/entrypoint.sh"]
 CMD ["autopush"]

entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ "${USE_JEMALLOC:-false}" = "true" ]; then
+    export LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libjemalloc.so.1"
+fi
+
+exec "$@"