Release v0.18.3

Changelog

Other

• 910b57f: Add docs for static_disk spec (@akclace)
• 7c46f2b: Added static_disk spec support (@akclace)
• 46f6547: Debug test failure (@akclace)
• 739d245: Fix blue-green deployment for Kubernetes apps (@akclace)
• b78d4d6: Fix polling for kubernetes test perf (@akclace)
• a77f2e2: Revert "Debug test failure" (@akclace)
• 998dc04: Update public docs (@akclace)
• 77620eb: Updated docs (@akclace)
• 75ab4b5: Updated docs for kubernetes changes (@akclace)
• 3b34234: Updated staging app docs (@akclace)
• 0ea1fb9: Use same image for stage and prod unless not possible (@akclace)