Docker: Fix git sshd

This was completely bugged out. This commit fixes git, provides
two separate cgit servers for the different URL bases and also
supplies a smartgit service for $AURWEB_URL/repo.git interaction.

Docker image needs to be rebuilt with this change:

    $ docker build -t aurweb:latest .

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker/scripts/run-smartgit.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+exec uwsgi \
+    --socket /var/run/smartgit/smartgit.sock \
+    --uid root \
+    --gid http \
+    --chmod-socket=666 \
+    --plugins cgi \
+    --cgi /usr/lib/git-core/git-http-backend