Get target and profile from nextest archive

[taiki-e]

Better solution for #334 and #348. (FYI @cwfitzgerald @weiznich)

Open the zstd file, parse the nextest metadata, and if that does not work (I assume it is a format that not stable between breaking releases), follow what is passed in the arguments.

This eliminates the need in most cases to pass the flags passed to cargo llvm-cov nextest-archive to cargo llvm-cov nextest --archive-file again.

Before:

cargo-llvm-cov/.github/workflows/ci.yml

Lines 90 to 91 in 959921c

	cargo llvm-cov nextest-archive --archive-file a.tar.zst --release
	cargo llvm-cov nextest --archive-file a.tar.zst --text --fail-under-lines 70 --release

cargo-llvm-cov/.github/workflows/ci.yml

Lines 99 to 100 in 959921c

	cargo llvm-cov nextest-archive --archive-file a.tar.zst --target "${host}"
	cargo llvm-cov nextest --archive-file a.tar.zst --text --fail-under-lines 70 --target "${host}"

After:

cargo-llvm-cov/.github/workflows/ci.yml

Lines 90 to 91 in 3bc61cb

	cargo llvm-cov nextest-archive --archive-file a.tar.zst --release
	cargo llvm-cov nextest --archive-file a.tar.zst --text --fail-under-lines 70

cargo-llvm-cov/.github/workflows/ci.yml

Lines 99 to 100 in 3bc61cb

	cargo llvm-cov nextest-archive --archive-file a.tar.zst --target "${host}"
	cargo llvm-cov nextest --archive-file a.tar.zst --text --fail-under-lines 70

[taiki-e]

Published in 0.6.6.

[weiznich]

Thanks for the fast fix ❤️ That's really appreciated