add .sha256 checksums to binary distribution tarballs (#3605) #1413

Job	Run time
build_examples	5m 7s
build_benchmarks	1m 10s
build_nightly	2m 47s
Check	1m 37s
Verify that web-sys is compiled correctly	1m 23s
Clippy	7m 47s
dist_linux_x86_64_musl	4m 6s
dist_linux_aarch64_gnu	5m 41s
dist_macos_aarch64	3m 6s
dist_macos_x86_64	3m 16s
dist_windows	5m 0s
doc_api	2m 7s
doc_book	12s
Rustfmt	11s
Build and test the deno example	1m 10s
Run js-sys crate tests	3m 27s
Run native tests	3m 53s
Run wasm-bindgen crate tests with multithreading enabled	2m 33s
Test TypeScript output of wasm-bindgen	1m 58s
Run UI compile-fail tests	3m 36s
Run wasm-bindgen crate tests (unix)	12m 2s
Run web-sys crate tests	8m 24s
Run wasm-bindgen-webidl crate tests	3m 9s
test_examples	3m 23s
deploy	3m 9s
	1h 30m 14s

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