Environment Variables on build time

[dawidmachon]

Hi,
case 1:
Does Environment Variables setup in UI will be available in Dockerfile in build phase?
For example, in normal docker:

#Dockerfile
ARG API_KEY

then in cli
docker build --build-arg API_KEY=your_api_key -t my-app .

Or this UI env are only run time in case of swiftwave?

Reference:
https://docs.docker.com/build/building/variables/

---

case 2, will this be supported?:
RUN --mount=type=secret

This mount type allows the build container to access secret values, such as tokens or private keys, without baking them into the image.
By default, the secret is mounted as a file. You can also mount the secret as an environment variable by setting the env option.

# syntax=docker/dockerfile:1
[FROM](https://docs.docker.com/reference/dockerfile/#from) alpine
[RUN](https://docs.docker.com/reference/dockerfile/#run) --mount=type=secret,id=API_KEY,env=API_KEY \
    some-command --token-from-env $API_KEY

docker buildx build --secret id=API_KEY .

reference:
https://docs.docker.com/reference/dockerfile/#run---mounttypesecret