Initialisiere VoTiAn NG mit Docker-Build, .env-Konfiguration und Cookie-Sitzungen

backend/src/main/java/de/stadtbote/votian/VotianApplication.java

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+package de.stadtbote.votian;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stadtbote.votian.database.DatabaseDiagnostics;
+import java.util.Arrays;
+import org.springframework.boot.Banner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+
+@SpringBootApplication
+public class VotianApplication {
+    public static void main(String[] args) {
+        if (Arrays.asList(args).contains("--database-check")) {
+            System.exit(databaseCheck());
+        }
+        SpringApplication.run(VotianApplication.class, args);
+    }
+
+    private static int databaseCheck() {
+        SpringApplication application = new SpringApplication(VotianApplication.class);
+        application.setWebApplicationType(WebApplicationType.NONE);
+        application.setBannerMode(Banner.Mode.OFF);
+        application.setLogStartupInfo(false);
+        DatabaseDiagnostics.Result result;
+        // Keep stdout machine-readable and prevent JDBC startup errors exposing connection details.
+        try (ConfigurableApplicationContext context = application.run(
+                "--spring.main.web-application-type=none", "--spring.main.banner-mode=off",
+                "--logging.level.root=OFF", "--logging.level.com.zaxxer.hikari=OFF",
+                "--logging.level.org.mariadb.jdbc=OFF")) {
+            result = context.getBean(DatabaseDiagnostics.class).check();
+        } catch (RuntimeException error) {
+            result = DatabaseDiagnostics.failure("CONFIGURATION_ERROR",
+                    "Backend-Konfiguration oder Datenbankverbindung prüfen.", null);
+        }
+        try {
+            System.out.println(new ObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(result.details()));
+        } catch (JsonProcessingException error) {
+            System.out.println("{\"connected\":false,\"reason\":\"DIAGNOSTIC_ERROR\",\"message\":\"Diagnose konnte nicht ausgegeben werden.\",\"writes\":0}");
+            return 1;
+        }
+        return result.exitCode();
+    }
+}