new: Add v1.15 blog post. (#1106) #1443

Job	Run time
Stable - x86_64-unknown-linux-gnu	1m 37s
Publish npm packages	0s
Stable - x86_64-unknown-linux-musl	3m 13s
Stable - aarch64-unknown-linux-gnu	3m 0s
Stable - aarch64-unknown-linux-musl	3m 32s
Stable - x86_64-apple-darwin	12m 39s
Stable - aarch64-apple-darwin	15m 18s
Stable - x86_64-pc-windows-msvc	22m 34s
Test - x86_64-unknown-linux-gnu	50s
Test - x86_64-unknown-linux-musl	1m 29s
Test - x86_64-apple-darwin	1m 22s
Test - x86_64-pc-windows-msvc	1m 33s
Publish cli/core packages	0s
	1h 7m 7s

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