Remove wait-for-it script in Core Container

Core will now wait for a database connection to get esablished
before attempting to serve any requests.

Dockerfile.deploy

@@ -9,14 +9,10 @@ RUN useradd --no-create-home -s /bin/bash ${ALMIGHTY_USER_NAME}
 
 COPY bin/alm ${ALMIGHTY_INSTALL_PREFIX}/bin/alm
 
-# This script waits for a port to be open before it continues to execute what's
-# behind the two dashes "--". See docker-compose.yaml for the place where we use this.
-ADD https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh /usr/local/bin/wait-for-it.sh
-RUN chmod +x /usr/local/bin/wait-for-it.sh
-
 # From here onwards, any RUN, CMD, or ENTRYPOINT will be run under the following user
 USER ${ALMIGHTY_USER_NAME}
 
-ENTRYPOINT [ "${ALMIGHTY_INSTALL_PREFIX}/bin/alm" ]
+WORKDIR ${ALMIGHTY_INSTALL_PREFIX}
+ENTRYPOINT [ "bin/alm" ]
 
 EXPOSE 8080

docker-compose.yml

@@ -2,20 +2,17 @@ version: '2'
 
 services:
   db:
-    image: postgres:9.5
+    image: centos/postgresql-95-centos7
     ports:
       - "5432:5432"
     environment:
-      POSTGRES_PASSWORD: mysecretpassword
+      POSTGRESQL_ADMIN_PASSWORD: mysecretpassword
     networks:
       - default
   core:
     image: almightycore/almighty-core:latest
     entrypoint:
-      - /usr/local/bin/wait-for-it.sh
-      - db:5432
-      - --
-      - /usr/bin/alm
+      - bin/alm
     command: -dbhost db
     ports:
       - "8080:8080"