Dev/Setup.md

+[script/setup.pl](ironapi-gw/script/ironapi_setup.pl)
+
+reads variables from the environment, to create the gateway configuration.
+
+Once the setup has run, it not re-create the configuration. To change the database config at a later point, edit `etc/ironapi_gw.conf`
+(which will have been generated by the setup script).
+
+These environment variables may be set (e.g. in a Dockerfile):
+
+```
+# db connect variables within the docker-network
+DBUSER=postgres
+DBHOST=genesis
+DBPORT=5432
+
+# Host port for API and GUI
+GW_PORT=3222
+
+# host and port for openapi ouput
+#GW_HOST_OPENAPI=localhost
+#GW_PORT_OPENAPI=GW_PORT
+
+# authentication key for caching
+GW_APIKEY=a9564ebc3289b7a14551baf8ad5ec60a
+
+# gateway options
+
+#GW_DEFAULT_PAGESIZE=10
+#GW_MAX_PAGESIZE=101
+#GW_ALLOW_LITERALS=0
+GW_HUGE_LIMIT=10
+#GW_UPLOAD_DIR_HOST=
+#GW_UPLOAD_DIR=/app/var/upload/
+#GW_VAR_DIR=/app/var/
+#GW_FILE_STORE_IN_DB=0
+
+# debug gateway (incl. listener)
+#look for code changes every second
+LISTENER_CHECK_FOR_CODE_CHANGES=1
+GW_DEBUG=1
+CATALYST_DEBUG=1
+DBIC_TRACE=1
+```