add image and dom snapshot comparison for storybook components
image snapshot comparison can been flaky and produce many
false-positives. a higher threshold has been used to mitigate this
although it may not identify all regressions. DOM snapshots
supplement images to increase the likelihood of capturing
regressions.
consideration was given to using a shared library built in rust
for this and the cli utility but this was discounted for these
reasons:
1. different data storage and caching requirements
2. ndk is more mature and has extra features for building web
apps
3. use of shared svelte components in ndk
4. prospect of contributing git specific components to ndk to
encourage adoption among other clientus
start with a nix boilerplate for svelte that supports reproducible
builds
taken unedited from https://github.com/knarkzel/sveltekit-nix
c444859e97fb13393ad6e295132412bbea044e32
DanConwayDev