backend: maven: add yaml file checking via spotless plugin

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

backend/pom.xml

@@ -299,6 +299,13 @@
                             <file>.license-header</file>
                         </licenseHeader>
                     </java>
+                    <yaml>
+                        <includes>
+                            <include>.diktat-analysis.yaml</include>
+                            <include>src/**/*.yml</include>
+                        </includes>
+                        <prettier></prettier>
+                    </yaml>
                 </configuration>
             </plugin>
         </plugins>

backend/src/main/resources/application.yml

@@ -34,7 +34,7 @@ spring:
 security:
   auth:
     header: Authorization
-    prefix: 'Bearer '
+    prefix: "Bearer "
     login-uri: /api/v1/authentication
   jwt:
     secret: ?E(H+MbQeThWmZq4t7w!z%C*F-J@NcRfUjXn2r5u8x/A?D(G+KbPdSgVkYp3s6v9