CI improvements #899

Job	Run time
Fuzz targets (afl)	2m 13s
build_benchmarks	1m 9s
Run tests on big endian architecture	1m 22s
Run tests on big endian architecture (default)	2m 59s
Run tests on big endian architecture (webp)	1m 19s
Run tests on big endian architecture (webp-encoder)	2m 43s
Run tests and doctests on ubuntu	4s
Run tests and doctests on ubuntu (default)	5s
Run tests and doctests on ubuntu (gif)	4s
Run tests and doctests on ubuntu (jpeg)	6s
Run tests and doctests on ubuntu (png)	4s
Run tests and doctests on ubuntu (tiff)	4s
Run tests and doctests on ubuntu (ico)	4s
Run tests and doctests on ubuntu (pnm)	4s
Run tests and doctests on ubuntu (tga)	6s
Run tests and doctests on ubuntu (webp)	5s
Run tests and doctests on ubuntu (bmp)	5s
Run tests and doctests on ubuntu (hdr)	4s
Run tests and doctests on ubuntu (dxt)	4s
Run tests and doctests on ubuntu (dds)	3s
Run tests and doctests on ubuntu (farbfeld)	5s
Run tests and doctests on ubuntu (openexr)	5s
Run tests and doctests on ubuntu (jpeg_rayon)	4s
Run tests and doctests on ubuntu (webp-encoder)	6s
Fuzz targets (cargo-fuzz)	7m 7s
cargo-deny	30s
Run tests and doctests on ubuntu (1.61.0)	1m 48s
Run tests and doctests on ubuntu (nightly)	1m 28s
Run tests and doctests on ubuntu (beta)	1m 16s
clippy	3m 25s
Public private dependencies	28s
rustfmt	20s
test_avif	2m 11s
test_avif_decoding	2m 13s
Verify Minimum Supported Rust Version in Cargo.toml	2m 18s
	36m 11s

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