Add details on backing up the database using the pg_dump tool and the…

… Railway CLI.

backup-database-from-railway.md

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+## Backing up the Railway Postgres Database
+
+### Pre-requisites
+
+* Railway CLI is installed, so we can get the environment variables pointing to the database. See https://docs.railway.app/guides/cli
+* Postgres binaries 15 or later (or at least as current as Railway's version) are installed (for pg_dump). See https://blog.railway.app/p/postgre-backup
+
+### Railway Shell
+
+1. railway link
+    * Link to the Ensembler project
+2. railway service
+    * Use the Ensembler service
+3. railway shell
+4. echo $PGPASSWORD
+5. pg_dump -U $PGUSER -h $PGHOST -p $PGPORT -W -F t $PGDATABASE > database-railway-<today's date>.dump
+6. exit