2.1-p9

• Add PostgreSQL 15, remove PostgreSQL 9.6 (@hughcapet, @CyberDem0n)
• Use Ubuntu 22.04 as the base image (@hughcapet, @CyberDem0n)
• Add workflow for multiarch builds (@mmoscher)
• Pass AWS STS regional endpoints environment variable to WAL-G (@ThomasK33)
• Support Service Principal for WAL-G backup to Azure (@stephan2012)

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• Patroni 2.1.5
• wal-g v2.0.1
• timescaledb 2.9.1
• PostGIS 3.3
• plprofiler 4.2.1
• pg_profile 4.1

*All extensions, except timescaledb and pllua support PG15

Image: ghcr.io/zalando/spilo-15:2.1-p9