v0.32.0

• workers: add UsageModel for scripts (#793)
• update SSL validation records for Custom Hostnames and Certificate Packs (#796)
• magic_transit: add support for GRE tunnels (#798)
• load_balancing: add support for geo based country_pools (#800)
• pages: support custom environment variables (#801)
• teams_devices: add initial support (#802)
• rulesets: add managed_challenge (#804)
• zone_cache_variants: add initial support (#805)