ci: add dependabot config and CI workflow #1

Job	Run time
rustfmt	15s
clippy	25s
test (macos-amd64, macos-latest, stable, x86_64-apple-darwin)	55s
test (linux-arm, ubuntu-latest, stable, arm-unknown-linux-musleabihf)	1m 28s
test (beta, ubuntu-latest, beta)	59s
test (nightly, ubuntu-latest, nightly)	58s
test (linux-amd64, ubuntu-latest, stable, x86_64-unknown-linux-musl)	1m 28s
test (stable, ubuntu-latest, stable)	1m 1s
test (stable-arm-musleabihf, ubuntu-latest, stable, armv7-unknown-linux-musleabihf)	1m 29s
test (macos-arm64, macos-14, stable, aarch64-apple-darwin)	47s
test (stable-x86, ubuntu-latest, stable, i686-unknown-linux-gnu)	1m 28s
test (windows-amd64, windows-latest, stable, x86_64-pc-windows-msvc)	1m 6s
test (linux-ppc64le, ubuntu-latest, stable, powerpc64le-unknown-linux-gnu)	1m 27s
test (linux-i686, ubuntu-latest, stable, i686-unknown-linux-musl)	1m 29s
test (win-gnu, windows-2022, nightly-x86_64-gnu)	1m 17s
test (stable-aarch64, ubuntu-latest, stable, aarch64-unknown-linux-gnu)	1m 29s
test (stable-arm-gnueabihf, ubuntu-latest, stable, armv7-unknown-linux-gnueabihf)	1m 27s
test (linux-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	1m 28s
test (linux-arm64, ubuntu-latest, stable, aarch64-unknown-linux-musl)	1m 28s
test (stable-arm-musleabi, ubuntu-latest, stable, armv7-unknown-linux-musleabi)	1m 16s
dependabot-auto-merge	1s
	23m 41s

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