Add Debian Jessie build image

This image is meant to be used to build packages for the Jessie release of Debian. See debian/nginx-build.

debian/jessie/Dockerfile

@@ -6,17 +6,19 @@ LABEL version="1.0"
 RUN echo "deb http://security.debian.org/ jessie/updates main" >> /etc/apt/sources.list
 
 RUN apt-get update \
-    && apt-get -yqqf install \
+    && apt-get -yqqf --no-install-recommends install \
         apt-transport-https \
         lsb-release \
         ca-certificates \
-        curl
+        curl \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
 RUN curl -ssL -o /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
 RUN echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list
 
 RUN apt-get update \
-    && apt-get -y install \
+    && apt-get -y --no-install-recommends install \
         git \
         dh-make \
         build-essential \
@@ -25,7 +27,6 @@ RUN apt-get update \
         libpcre3 \
         libpcre3-dev \
         libz-dev \
-        shellcheck \
         gnupg \
         libssl-dev \
     && apt-get clean \