Install jemalloc deb

Signed-off-by: Mathieu Velten <matmaul@gmail.com>

Author: MatMaul

changelog.d/8553.docker

@@ -0,0 +1 @@
+Install jemalloc deb in docker image.

docker/Dockerfile

@@ -66,6 +66,7 @@ RUN apt-get update && apt-get install -y \
     libpq5 \
     libwebp6 \
     xmlsec1 \
+    libjemalloc2 \
  && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder /install /usr/local