Add missing authorization properties in Application. Add hibernate dialect for postgres12

src/main/java/eu/dnetlib/developers/DevelopersAPIApplication.java

@@ -13,6 +13,7 @@ import org.springframework.context.annotation.PropertySources;
 @SpringBootApplication(scanBasePackages = {"eu.dnetlib.developers"})
 @PropertySources({
         @PropertySource("classpath:authentication.properties"),
+        @PropertySource("classpath:authorization.properties"),
         @PropertySource("classpath:developers.properties"),
         @PropertySource(value = "classpath:dnet-override.properties", ignoreResourceNotFound = true)
 })

src/main/resources/developers.properties

@@ -1,4 +1,5 @@
 developers.datasource.driver=org.postgresql.Driver
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
 
 ## API Documentation Properties
 api.title = Developers API