Add schemaspy support

[jabrena]

java -jar schemaSpy.jar -t "pgsql" -o "./spy_data" \
    -host "localhost" -port "5432" -dp "postgresql-42.5.4.jar" \
    -db "postgres" -u "postgres" -p "sakila" -s "public"

[jabrena]

• https://sourceforge.net/projects/schemaspy/files/schemaspy/
• https://github.com/russgray/schemaspy-postgres/blob/master/Dockerfile
• https://jdbc.postgresql.org/download/

[jabrena]

Add a docker file with the solution tested in local

[jabrena]

• https://stackoverflow.com/questions/46032392/docker-compose-does-not-allow-to-use-local-images

[jabrena]

• https://github.com/saitooooooo/schemaspy-docker
• https://github.com/pp-develop/docker-schemaspy

[jabrena]

• https://mvnrepository.com/artifact/org.postgresql/postgresql/42.5.4

[jabrena]

https://github.com/jabrena/spring-boot-relational-database-poc/pull/72