v3.0.0-beta6

What's Changed

• fix Docker build by @wouterlucas in #553
• Remove deprecated preventCleanup flag by @wouterlucas in #551
• Cleanup left over platform calls by @wouterlucas in #550
• Update framebufferDimensions handling to support null values based on parentHasRenderTexture by @wouterlucas in #555
• Fix/shader border precision by @jfboeve in #554
• refactor: simplify isProduction check and remove unused assertions by @wouterlucas in #552

Full Changelog: v3.0.0-beta5...v3.0.0-beta6