Add property 'db.name' to enable config of DB connection during build time

financer-server/src/main/resources/config/application-postgres.properties

@@ -1,8 +1,11 @@
 spring.flyway.locations=classpath:/database/postgres,classpath:/database/common
 
-spring.datasource.url=jdbc:postgresql://localhost/financer
-spring.datasource.username=financer
-spring.datasource.password=financer
+# Placeholder @db.name@ maps to the property db.name in the server POM.
+# Its default value is 'financer'
+# Enables easy configuration of DB name/user to use at build time
+spring.datasource.url=jdbc:postgresql://localhost/@db.name@
+spring.datasource.username=@db.name@
+spring.datasource.password=@db.name@
 
 # See https://github.com/spring-projects/spring-boot/issues/12007
-spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
+spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true