Initial work on Docker support

.env.example

@@ -1 +1,36 @@
-KEY=32_character_encryption_key
+ENCRYPTION_KEY=32_character_encryption_key
+
+CLIENT_ID=
+CLIENT_SECRET=
+BOT_TOKEN=
+
+OAUTH_CALLBACK_URL=
+DASHBOARD_DOMAIN=
+API_DOMAIN=
+PORT=443
+
+# The MySQL database running in the container is exposed to the host on this port,
+# allowing access with database tools such as DBeaver
+MYSQL_PORT=3001
+# Password for the Zeppelin database user
+MYSQL_PASSWORD=
+# Password for the MySQL root user
+MYSQL_ROOT_PASSWORD=
+
+# The development environment container has an SSH server that you can connect to.
+# This is the port that server is exposed to the host on.
+DEVELOPMENT_SSH_PORT=3002
+
+# Only required if relevant feature is used
+#PHISHERMAN_API_KEY=
+
+# In production, the newest code is pulled from a repository
+# Specify that repository URL here
+PRODUCTION_REPOSITORY=https://github.com/ZeppelinBot/Zeppelin.git
+
+# You only need to set these if you're running an external database.
+# In a standard setup, the database is run in a docker container.
+#DB_HOST=
+#DB_USER=
+#DB_PASSWORD=
+#DB_DATABASE=