fix: enable env vars in setup steps (and deprecate admin subcommand) (#3871)

* fix: enable env vars in setup steps (and deprecate admin subcommand)

* fix tests and error text

cmd/initialise/helper.go

@@ -0,0 +1,28 @@
+package initialise
+
+import (
+	"database/sql"
+)
+
+func exists(query string, args ...interface{}) func(*sql.DB) (exists bool, err error) {
+	return func(db *sql.DB) (exists bool, err error) {
+		row := db.QueryRow("SELECT EXISTS("+query+")", args...)
+		err = row.Scan(&exists)
+		return exists, err
+	}
+}
+
+func exec(stmt string, args ...interface{}) func(*sql.DB) error {
+	return func(db *sql.DB) error {
+		_, err := db.Exec(stmt, args...)
+		return err
+	}
+}
+
+func verify(db *sql.DB, checkExists func(*sql.DB) (bool, error), create func(*sql.DB) error) error {
+	exists, err := checkExists(db)
+	if exists || err != nil {
+		return err
+	}
+	return create(db)
+}