This change updates dispatching of SDK and OS image builds from changes
to a PR to an explicit comment. PRs will only be built if that comment
was added by a member of the Flatcar maintainers team.
Signed-off-by: Thilo Fromm <thilofromm@microsoft.com>
This change adds a github actions workflow to build a new SDK container
based on an existing SDK container. This can be used for CI testing
intrusive changes that also affect the SDK without bootstrapping a whole
new SDK.
Signed-off-by: Thilo Fromm <thilofromm@microsoft.com>