Also pack source for release. #4874

Job	Run time
CheckFormatAndBuildClean	2m 0s
ClangTidy	4m 18s
KytheVerification	0s
x86_64 test	3m 36s
MacOsBuild	3m 57s
arm64 test	4m 8s
x86_64 test-clang	3m 51s
arm64 test-clang	4m 8s
KytheXrefs	0s
x86_64 test-nortti	3m 41s
📦 Pack Sources	4s
x86_64 test-c++20	3m 24s
x86_64 test-c++23	3m 34s
WindowsBuild	4m 37s
x86_64 smoke-test	4m 59s
PrepareVSPlugin	2m 45s
arm64 smoke-test	4m 57s
x86_64 asan	5m 10s
x86_64 asan-clang	4m 55s
x86_64 compile	4m 1s
arm64 compile	4m 4s
x86_64 compile-clang	3m 21s
arm64 compile-clang	3m 47s
x86_64 compile-static	3m 40s
arm64 compile-static	3m 49s
x86_64 compile-static-clang	3m 13s
arm64 compile-static-clang	3m 45s
x86_64 clean	5m 3s
arm64 clean	5m 4s
Build and deploy GitHub pages	1s
📦 Release	1s
	1h 43m 53s

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