[+] Check sqlite before application start

src/main/java/icu/samnyan/aqua/spring/DataSourceConfig.kt

@@ -0,0 +1,18 @@
+package icu.samnyan.aqua.spring
+
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.annotation.Configuration
+import java.lang.System.err
+import kotlin.system.exitProcess
+
+@Configuration
+class DataSourceConfig(@Value("\${spring.datasource.url}") val databaseUrl: String) {
+    init {
+        if (databaseUrl.lowercase().contains("jdbc:sqlite:", ignoreCase = true)) {
+            err.println("!!! ERROR !!!\n" +
+                "SQLite isn't supported in the v1 development branch yet.\n" +
+                "Please either switch to MariaDB or wait for the stable v1 release.\n")
+            exitProcess(1)
+        }
+    }
+}