builder: add fedora-coreos-cloud project

[lbajolet-hashicorp]

When a user specifies a image_family_name to get the latest version of an image to build their custom image upon, the plugin attempts to get the family specified from a static list of projects.

In this case, a user attempted to get the fedora-coreos-stable' family, present in the fedora-coreos-cloud` project, which was not in the default list of the GCE driver.

This commit changes this.

Closes: #191

[lbajolet-hashicorp]

Note: as mentioned in the related issue, we should definitely add a way for users to specify the project they want to get their image from if someone else in the future attempts to get their image from another yet unsupported project.

[nywilken]

Note: as mentioned in the related issue, we should definitely add a way for users to specify the project they want to get their image from if someone else in the future attempts to get their image from another yet unsupported project.

Note: as mentioned in the related issue, we should definitely add a way for users to specify the project they want to get their image from if someone else in the future attempts to get their image from another yet unsupported project.

Let’s create an issue for this if one doesn’t exist.

[nywilken]

LGTM - feel free to cut a release for this.

[lbajolet-hashicorp]

Will do tomorrow for sure!