Implement backend for contact form with gateway integration

backend/server/src/main/resources/application.yml

@@ -0,0 +1,31 @@
+server:
+  port: 0  # random port
+
+spring:
+  application:
+    name: server
+  datasource:
+    url: jdbc:postgresql://localhost:5432/rheinsw_dev
+    username: rheinsw
+    password: rheinsw
+
+  jpa:
+    hibernate:
+      ddl-auto: none
+    show-sql: true
+    properties:
+      hibernate:
+        format_sql: true
+
+eureka:
+  client:
+    service-url:
+      defaultZone: http://localhost:8761/eureka/
+
+hcaptcha:
+  secret: ES_ff59a664dc764f92870bf2c7b4eab7c5
+
+logging:
+  level:
+    org.hibernate.SQL: DEBUG
+    org.hibernate.type.descriptor.sql.BasicBinder: TRACE