feat: add Dockerfile for build within docker environment and run application within a container.

HealthCheck.java

@@ -0,0 +1,20 @@
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse.BodyHandlers;
+
+public class HealthCheck {
+
+    public static void main(String[] args) throws InterruptedException, IOException {
+        var client = HttpClient.newHttpClient();
+        var request = HttpRequest.newBuilder()
+            .uri(URI.create("http://localhost:8001/actuator/health"))
+            .header("accept", "application/json")
+            .build();
+        var response = client.send(request, BodyHandlers.ofString());
+        if (response.statusCode() != 200 || !response.body().contains("UP")) {
+            throw new RuntimeException("Healthcheck failed");
+        }
+    }
+}