feat: add sccache to the build pipeline #1467

Job	Run time
test_toolchains (1.67.1)	2m 33s
test_features	57s
build_benchmarks	53s
Fuzz targets (afl)	2m 8s
test_features (default)	1m 53s
test_toolchains (nightly)	1m 43s
test_features (rayon)	42s
test_toolchains (beta)	2m 1s
test_features (avif)	1m 11s
Fuzz targets (cargo-fuzz)	1m 19s
cargo-deny	24s
test_features (bmp)	43s
test_features (dds)	34s
clippy	2m 13s
public_private_dependencies	31s
test_features (exr)	1m 1s
rustfmt	5s
test_features (ff)	34s
test_avif_decoding	1m 33s
test_features (gif)	38s
test_other_archs (powerpc-unknown-linux-gnu)	3m 18s
cargo-semver-checks	28s
test_features (hdr)	34s
test_other_archs (i686-unknown-linux-gnu)	2m 6s
test_features (ico)	53s
test_features (jpeg)	47s
test_features (png)	45s
test_features (pnm)	34s
test_features (qoi)	33s
test_features (tga)	32s
test_features (tiff)	46s
test_features (webp)	40s
	35m 32s

Provide feedback