Dockerfile fixes

Dockerfile

@@ -3,6 +3,7 @@ FROM debian:stretch-slim
 ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update \
+    && apt-get install -y --no-install-recommends apt-utils \
     && apt-get install -y --no-install-recommends \
         curl \
         gnupg2 \
@@ -12,6 +13,7 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/* \
     && npm -g install pm2
 
+
 WORKDIR /salix
 COPY package.json package-lock.json ./
 COPY loopback/package.json loopback/