Draft: feat: Postgres images for SE (database-lab#463)

Prepare images

• Generic (current image)
  • Remove from it: Timescale, Citus
• Generic-PostGIS
• [SE only] RDS/Aurora (with mocked rds-specific extensions: see https://thepedestrian.in/notes/mocking_aws_extensions/)
• [SE only] Supabase
• [SE only] Timescale Cloud
• [SE only] Heroku

CI pipelines

• enable custom AWS-runner
• build heavy extensions and store them to Package Registry (e.g., plv8)
• build release images