v3.1.0 🌈

Changes

• 🎉Upgraded pgAdmin to 8.10 See release notes: https://www.pgadmin.org/docs/pgadmin4/development/release_notes_8_10.html
• ⬆️ Updated base-image to 16.2.1
• ⬆️ Added pgAdmin4 addon to the new CI/CD pipeline @expaso (#10) for easier development