Added custom build script to allow users to re-build in order to support custom CPU architecture including ARM.

app-backend/clean-custom-release-build.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+if ! [ $(id -u) = 0 ]; then
+   echo "Must run as sudo or root"
+   exit 1
+fi
+
+docker build -t captain-custom-release-build -f dockerfile-captain.release .
+
+mkdir /captain
+
+if docker service ps captain-captain ; then
+    echo "captain-captain service already exists. Trying to update it..."
+else
+    echo "Installing CaptainDuckDuck..."
+    docker run \
+       -v /var/run/docker.sock:/var/run/docker.sock \
+       captain-custom-release-build
+fi
+
+sleep 5s
+docker service update --image captain-custom-release-build captain-captain