config: move default config var to Dockerfile

bitnami/codeigniter/Dockerfile

@@ -26,6 +26,11 @@ RUN bitnami-pkg install codeigniter-3.1.3-0 --checksum 5d653ed41a2bf4f78818f5cb2
 
 COPY rootfs /
 
+ENV MARIADB_USER="root" \
+    MARIADB_HOST="mariadb" \
+    MARIADB_PORT="3306" \
+    CODEIGNITER_PROJECT_NAME="myapp"
+
 WORKDIR /app
 
 EXPOSE 8000

bitnami/codeigniter/docker-compose.yml

@@ -2,8 +2,6 @@ version: '2'
 services:
   myapp:
     image: bitnami/codeigniter:latest
-    environment:
-      - CODEIGNITER_PROJECT_NAME=
     ports:
       - '8000:8000'
     volumes:

bitnami/codeigniter/rootfs/app-entrypoint.sh

@@ -1,12 +1,6 @@
 #!/bin/bash
 set -e
 
-# Set default values
-export MARIADB_USER=${MARIADB_USER:-"root"}
-export MARIADB_HOST=${MARIADB_HOST:-"mariadb"}
-export MARIADB_PORT=${MARIADB_PORT:-"3306"}
-export CODEIGNITER_PROJECT_NAME=${CODEIGNITER_PROJECT_NAME:-"myapp"}
-
 PROJECT_DIRECTORY=/app/$CODEIGNITER_PROJECT_NAME
 DEPLOY="$@"