feat: add PostgreSQL/MongoDB Images and fix multiarch (#40)

add PostgreSQL/MongoDB Images and fixes multi-arch builds for MariaDB, Redis.

postgres/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/ash
+cd /home/container
+
+#output current postgres version
+postgres --version
+
+# Make internal Docker IP address available to processes.
+export INTERNAL_IP=`ip route get 1 | awk '{print $NF;exit}'`
+
+# Replace Startup Variables
+MODIFIED_STARTUP=`eval echo $(echo ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')`
+echo ":/home/container$ ${MODIFIED_STARTUP}"
+
+# Run the Server
+eval ${MODIFIED_STARTUP}