Add tests for multipart mime in coreos-cloudinit

[gabriel-samfira]

Add tests for the multipart mime support in coreos-cloudinit

The new multipart mime support that is currently being proposed against coreos-cloudinit needs to be tested. This PR adds the needed tests.

These tests will validate that we properly parse the multipart mime user-data and all parts are run correctly.

• Changelog entries added in the respective changelog/ directory (user-facing change, bug fix, security fix, update)
• Inspected CI output for image differences: /boot and /usr size, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.

[gabriel-samfira]

It seems I don't have access to push to ghcr.io/flatcar/mantle. I'll try and push to my own fork.

[pothos]

It seems I don't have access to push to ghcr.io/flatcar/mantle. I'll try and push to my own fork.

Strange, I thought that would work for all PRs…

[gabriel-samfira]

It seems I don't have access to push to ghcr.io/flatcar/mantle. I'll try and push to my own fork.

Strange, I thought that would work for all PRs…

Nope. This section:

mantle/.github/workflows/docker.yml

Lines 44 to 49 in 9cdaa3b

	- name: Login to registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

Defines the login credentials. The actor in this case is the PR author and I do not have write access to the mantle packages.

[pothos]

Is the token the same or also bound to the author?

[gabriel-samfira]

Yup. The actor and the token belong to the person triggering the workflow. If triggered via PR, they belong to the author. If triggered via workflow_dispatch they belong to the person running the action.

[gabriel-samfira]

Converted to draft for now. This opened a can of worms. Apparently I need to parse the userdata here as well to determine its type and add the testing ssh keys to it so kola can access the vms. Will update it next week.

[pothos]

Looks good, thanks a lot! I added a few comments.