feat: configure ports, db url and api url with env variables

backend/src/main.ts

@@ -30,6 +30,6 @@ async function bootstrap() {
     SwaggerModule.setup("api/swagger", app, document);
   }
 
-  await app.listen(8080);
+  await app.listen(process.env.PORT || 8080);
 }
 bootstrap();

backend/src/prisma/prisma.service.ts

@@ -7,7 +7,9 @@ export class PrismaService extends PrismaClient {
     super({
       datasources: {
         db: {
-          url: "file:../data/pingvin-share.db?connection_limit=1",
+          url:
+            process.env.DATABASE_URL ||
+            "file:../data/pingvin-share.db?connection_limit=1",
         },
       },
     });