Create .env.docker

Creates the .env specifically for docker that omits key variables needed to be defined at runtime by the user.

.env.docker

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+# This .env file is for use in the Docker build step, setting all the internal
+# variables that could be later overridden by the user.
+
+# We expect the following variables to be set by the user:
+# DB_HOST
+# DB_USER
+# DB_PASS
+# REDIS_HOST
+
+# define the port on which the HTTP server will listen.
+PORT=8080
+
+# MySQL Database Configuration
+# The following variables should be pretty straightforward.
+# DB_PORT is the MySQL server port
+DB_PORT=3306
+
+# Secret Session Variables
+# Used by express-session middleware for encryption.  This is just a temporary example.
+# In production, use a secure generator for this:
+# EX: openssl rand -hex 25
+SESS_SECRET=zC8YmujYRe9EoJVXUEJVzuK3pxDCJzYySJo5Vj5CefwXiiPYCVehutAJVqQ6SNwd
+
+# define logging level for the npm debug module.
+DEBUG=app,errors
+
+# define the directory where reports, files, and images will be uploaded.
+# Upload directory requirements:
+#   - Must be writable by the application user.
+#   - Must be a relative directory within the Bhima installation.
+UPLOAD_DIR='client/upload'
+
+# Report directory (Define where reports will be saved on the server)
+REPORT_DIR=''
+
+# SMTP Credentials
+SMTP_USERNAME="user@smtp.server"
+SMTP_PASSWORD="SomePassword"
+SMTP_HOST="some.host.com"