nuget cache in buildkit containers

[jeremymartin-snowden]

I have a microservices .net suite of applications that when building all use essentially the same nuget packages which makes caching preferrable. Each project has a dockerfile which I use the following

RUN \
  --mount=type=cache,target=/root/.nuget/packages \  
  --mount=type=cache,target=/root/.local/share/NuGet/http-cache \
  --mount=type=cache,target=/root/.local/share/NuGet/plugin-cache \
  --mount=type=cache,target=/tmp/NuGetScratchroot \
  dotnet restore --configfile ./nuget.config "./ProjectA.csproj"

My understanding is that each dockerfile in the docker-bake.hcl if setup the same way would then use the same cache coming from the buildkit container. I am wondering if my understanding is correct here?

In addition if I was to push the resultant buildkit container to my CI/CD my understanding is that --mount=type=cache would be lost once the final image is created. So in a CI/CD environment does that mean every time a dotnet restore is performed the nuget packages would be downloaded?

Many thanks for any help here