Skip rendering sky if viewport is set to transparent background #30182

Job	Run time
📊 Static checks / Code style, file formatting, and docs	32s
🐧 Linux / Editor w/ Mono (target=editor)	7m 23s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	45m 20s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	35m 9s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	30m 53s
🍏 iOS / Template (target=template_release)	11m 14s
🐧 Linux / Template w/ Mono (target=template_release)	25m 4s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 52s
🤖 Android / Template (target=template_release)	30m 35s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	23m 15s
🌐 Web / Template w/o threads (target=template_release, threads=no)	23m 4s
🍎 macOS / Editor (target=editor, tests=yes)	29m 56s
🏁 Windows / Editor (target=editor, tests=yes)	49m 29s
🍎 macOS / Template (target=template_release)	20m 22s
🏁 Windows / Template (target=template_release)	32m 53s
🪲 Godot CPP / Build and test Godot CPP	7m 3s
	6h 27m 4s

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