Initial apt-cache-ng setup.

.env

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+USERID=1000:1000
+

README.md

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+# Using apt-cache
+
+From: https://apimirror.com/docker~17/engine/examples/apt-cacher-ng/index
+
+I have updated it so it runs as any UID:GID.  See the above on various options to utilize this with apt.
+
+I am using option #2, but localizing it with an export statement.  This sets the http_proxy, but just for that one statement.
+
+* Edit the .env file and set the USERID to your uid and gid.  __Possibly 1000:1000__
+* Create cache directory
+* Build image, and start the container.
+
+````
+docker-compose build
+docker-compose up -d
+````
+
+````
+"DOCKER_HOST=$(ip -4 addr show docker0 | grep -Po 'inet \K[\d.]+')"
+````
+
+This will give you the IP address of the host system to be used in your builds.
+
+# Displaying apt-cacher-ng stats
+
+Open http://127.0.0.1:3142/acng-report.html in your web browser.
+
+# Using in Dockerfile
+
+````
+RUN export http_proxy=http://192.168.254.83:3142 \
+  && apt-get update && apt-get -y install wget build-essential unzip
+````

docker-compose.yml

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+version: "3"
+
+services:
+  apt-cache:
+    build: 
+      context: image
+      args: 
+        UID: ${USERID}
+    image: apt-cache
+    volumes:
+      - ./cache:/var/cache/apt-cacher-ng
+    ports:
+      - "3142:3142"
+    user: ${USERID}
+

image/Dockerfile

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+#
+# Build: docker build -t apt-cacher .
+# Run: docker run -d -p 3142:3142 --name apt-cacher-run apt-cacher
+#
+# and then you can run containers with:
+#   docker run -t -i --rm -e http_proxy http://dockerhost:3142/ debian bash
+#
+# Here, `dockerhost` is the IP address or FQDN of a host running the Docker daemon
+# which acts as an APT proxy server.
+
+FROM debian:stretch-slim
+EXPOSE      3142
+ARG UID
+VOLUME      ["/var/cache/apt-cacher-ng"]
+
+RUN     apt-get update && apt-get install -y apt-cacher-ng && \
+ sed -i "s%# ForeGround: 0%ForeGround: 1%g" /etc/apt-cacher-ng/acng.conf && \
+ chown -R $UID /etc/apt-cacher-ng && \
+ chown -R $UID /var/log/apt-cacher-ng && \
+ rm -rf /var/lib/apt/lists/*
+ 
+USER UID
+CMD     ["/usr/sbin/apt-cacher-ng", "-c", "/etc/apt-cacher-ng"]
+