chore(docker): update environment variable prefixes to AMCS

scripts/migrate.sh

@@ -2,10 +2,10 @@
 
 set -euo pipefail
 
-DATABASE_URL="${DATABASE_URL:-${OB1_DATABASE_URL:-}}"
+DATABASE_URL="${DATABASE_URL:-${AMCS_DATABASE_URL:-}}"
 
 if [[ -z "${DATABASE_URL}" ]]; then
-  echo "DATABASE_URL or OB1_DATABASE_URL must be set" >&2
+  echo "DATABASE_URL or AMCS_DATABASE_URL must be set" >&2
   exit 1
 fi