Using binary caching in a github action for snapcraft and flatpak

[bwrsandman]

I'm trying to leverage the binary caching as outlined in this document.

The issue is that for snap and flatpak, the builds are done in an isolated environment.
Is there a way to pass along the cache to these environments or should I be pre-building my dependencies?

Environment:

• Github actions (PR, Tag, Commit)
• Using source path instead of git cloning
• flatpak container: bilelmoussaoui/flatpak-github-actions:freedesktop-23.08
• snapcraft action: diddlesnaps/snapcraft-multiarch-action@v1
• I'm compiling for x86, x64 and arm64
• Using vcpkg manifest with submodule