Allow custom environment variables

[brennanwilkes]

It would be helpful to allow environment variables to be passed to docker's build context, so that deployment time logic (like versions, tags, etc) can be baked into the final image

[thgreasi]

Hi,
This sounds useful.
You should be able to workaround this by adding an extra step to your workflow which creates a .balena/balena.yml file inside the project's directory and defining the build time env vars/secrets there.

- name: decode build time secrets
  shell: bash
  run: |
    set -ax

    mkdir -p ".balena"

    echo "${{ secrets.BUILD_TIME_SECRET_ENV_VARS }}" \
      | base64 -d > ".balena/balena.yml"

The base64 decoded .balena/balena.yml file should look like the one described in our docs:
https://www.balena.io/docs/learn/deploy/deployment/#build-variables

[jellyfish-bot]

[thgreasi] This has attached https://jel.ly.fish/c50c50aa-06a3-43d2-8ade-75a8f7ba127b