fix: invalid INTERNAL_IP environment value

New IP route output appends UID to the result, causing the value to be set to that instead of the IP. Fix it by ignoring the last two appended UID results

postgres/entrypoint.sh

@@ -5,7 +5,8 @@ cd /home/container
 postgres --version
 
 # Make internal Docker IP address available to processes.
-export INTERNAL_IP=`ip route get 1 | awk '{print $NF;exit}'`
+INTERNAL_IP=$(ip route get 1 | awk '{print $(NF-2);exit}')
+export INTERNAL_IP
 
 # Replace Startup Variables
 MODIFIED_STARTUP=`eval echo $(echo ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')`