fix: Get PostgreSQL settings via env vars

[whiterabbit1983]

[!IMPORTANT]. Update PostgreSQL settings in scheduler/docker-compose.yml to use environment variables for dynamic configuration.. .

• Environment Variables:.
  • Updated DB, DB_PORT, and DB_HOST in scheduler/docker-compose.yml to use environment variables TEMPORAL_POSTGRES_DB, TEMPORAL_POSTGRES_PORT, and TEMPORAL_POSTGRES_HOST with default values..
• Configuration:.
  • Allows dynamic configuration of PostgreSQL settings via environment variables, enhancing flexibility.. . ^{This description was created by for 1b87f6b757e4d18dba0d3fdc40a14ccaff978bb5. It will automatically update as commits are pushed.}