feat: propper db persistence w/ docker support

src/main/kotlin/at/dokkae/homepage/Homepage.kt

@@ -1,5 +1,6 @@
 package at.dokkae.homepage
 
+import at.dokkae.homepage.config.Environment
 import at.dokkae.homepage.extensions.Precompiled
 import at.dokkae.homepage.repository.MessageRepository
 import at.dokkae.homepage.repository.impls.JooqMessageRepository
@@ -24,7 +25,6 @@ import org.http4k.sse.SseMessage
 import org.http4k.sse.SseResponse
 import org.http4k.template.JTETemplates
 import org.http4k.template.ViewModel
-import org.jetbrains.kotlin.backend.common.push
 import org.jooq.SQLDialect
 import org.jooq.impl.DSL
 import java.sql.DriverManager
@@ -51,9 +51,12 @@ data class Message(
 }
 
 fun main() {
-    val env = dotenv()
+    val env = Environment.load(dotenv {
+        ignoreIfMissing = true
+        ignoreIfMalformed = true
+    })
 
-    val connection = DriverManager.getConnection(env["DB_URL"], env["DB_USERNAME"], env["DB_PASSWORD"])
+    val connection = DriverManager.getConnection(env.dbUrl, env.dbUsername, env.dbPassword)
     val dslContext = DSL.using(connection, SQLDialect.POSTGRES)
     val messageRepository: MessageRepository = JooqMessageRepository(dslContext)
 
@@ -98,7 +101,7 @@ fun main() {
         }
     )
 
-    poly(http, sse).asServer(Jetty(port = 9000)).start()
+    poly(http, sse).asServer(Jetty(port = env.port)).start()
 
-    println("Server started on http://localhost:9000")
+    println("Server started on http://${env.host}:${env.port}")
 }

src/main/kotlin/at/dokkae/homepage/config/Environment.kt

@@ -0,0 +1,31 @@
+package at.dokkae.homepage.config
+
+import io.github.cdimascio.dotenv.Dotenv
+
+data class Environment(
+    val port: Int,
+    val host: String,
+    val dbUrl: String,
+    val dbUsername: String,
+    val dbPassword: String,
+) {
+    companion object {
+        /**
+         * Returns a loaded Environment object instance.
+         * @throws IllegalStateException if required environment variables were not found within the provided `dotenv` instance.
+         */
+        fun load(dotenv: Dotenv): Environment = Environment(
+            port = requireEnv(dotenv, "PORT").toInt(),
+            host = requireEnv(dotenv, "HOST"),
+            dbUrl = requireEnv(dotenv, "DB_URL"),
+            dbUsername = requireEnv(dotenv, "DB_USERNAME"),
+            dbPassword = requireEnv(dotenv, "DB_PASSWORD"),
+        )
+
+        private fun requireEnv(dotenv: Dotenv, key: String): String {
+            return dotenv[key] ?: throw IllegalStateException(
+                "Missing required environment variable: $key"
+            )
+        }
+    }
+}