Make cache dir configurable with an environment variable #298

Job	Run time
test (ubuntu-latest)	1m 13s
lint	1m 4s
update-release-draft	0s
test (macos-latest)	1m 53s
test (windows-latest)	1m 52s
package (aarch64-unknown-linux-musl, ubuntu-latest, tar, true)	4m 4s
package (x86_64-unknown-linux-musl, ubuntu-latest, tar, true)	2m 38s
package (aarch64-apple-darwin, macos-latest-xlarge, gtar, false)	1m 22s
package (x86_64-apple-darwin, macos-latest, gtar, false)	5m 23s
package (x86_64-pc-windows-msvc, windows-latest, tar, false, .exe)	7m 24s
release	0s
	26m 53s

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