feat: Add `STACK` and `DEMO` templating parameters #455

Job	Run time
General Pull Request Checks / Run Cargo Deny (advisories)	47s
General Pull Request Checks / Run Cargo Udeps	2m 36s
General Pull Request Checks / Run RustDoc	7m 13s
General Pull Request Checks / Run Cargo Deny (bans licenses sources)	45s
General Pull Request Checks / Run Cargo Tests	1m 22s
General Pull Request Checks / All tests passed	2s
Helm Chart Check	24s
Publish amd64 Image	14m 42s
Publish arm64 Image	12m 43s
Build and publish manifest list	46s
	41m 20s

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