feat: Select versions of demos & stacks #273

Job	Run time
General Pull Request Checks / Run Cargo Deny (advisories)	39s
General Pull Request Checks / Run Cargo Udeps	1m 43s
General Pull Request Checks / Run Clippy	1m 33s
General Pull Request Checks / Run Cargo Deny (bans licenses sources)	46s
General Pull Request Checks / Run RustDoc	1m 45s
General Pull Request Checks / Run Rustfmt	12s
General Pull Request Checks / Run Cargo Tests	1m 7s
General Pull Request Checks / All tests passed	1s
Build stackablectl for x86_64-unknown-linux-gnu	55s
Build stackablectl for aarch64-unknown-linux-gnu	3m 37s
Build stackablectl for x86_64-apple-darwin	2m 12s
Build stackablectl for aarch64-apple-darwin	1m 4s
	15m 34s

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