Initial Docker Compose workflow for Tower cluster

The goal is to share a common pattern with the existing development work

tools/docker-compose/Dockerfile-haproxy

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+FROM haproxy:1.6-alpine
+COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg

tools/docker-compose/haproxy.cfg

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+global
+    debug
+    stats socket /tmp/admin.sock
+    stats timeout 30s
+
+defaults
+    log     global
+    mode    http
+    option  httplog
+    option  dontlognull
+    timeout connect 5000
+    timeout client  50000
+    timeout server  50000
+
+frontend localnodes
+    bind *:8013
+    mode http
+    default_backend nodes
+
+backend nodes
+    mode http
+    balance roundrobin
+    option forwardfor
+    option http-pretend-keepalive
+    http-request set-header X-Forwarded-Port %[dst_port]
+    http-request add-header X-Forwarded-Proto https if { ssl_fc }
+    option httpchk HEAD / HTTP/1.1\r\nHost:localhost
+    server tower_1 tower_1:8013 check
+    server tower_2 tower_2:8013 check
+    server tower_3 tower_3:8013 check
+
+listen stats
+    bind *:1936
+    stats enable
+    stats uri /
+