make everything Customisable™️

src/main/kotlin/dev/frogmc/DB.kt

@@ -7,15 +7,25 @@ import org.jetbrains.exposed.sql.transactions.transaction
 object DB {
     var db: Database? = null
 
+    private fun getEnv(name: String, default: String): String {
+        return System.getenv(name) ?: default
+    }
+
     fun init(): Boolean {
         // use postgresql
         try {
+            val database = getEnv("FROGMC_META_DATABASE", "frogmc")
+            val user = getEnv("FROGMC_META_USER", "postgres")
+            val password = getEnv("FROGMC_META_PASSWORD", "example")
+            val host = getEnv("FROGMC_META_HOST", "localhost")
+            val port = getEnv("FROGMC_META_PORT", "5432")
+
             logger.info("Connecting to the database...")
             val d = Database.connect(
-                url = "jdbc:postgresql://localhost:5432/frogmc",
+                url = "jdbc:postgresql://$host:$port/$database",
                 driver = "org.postgresql.Driver",
-                user = "postgres",
-                password = "example"
+                user,
+                password
             )
             db = d
             transaction(db) {