feat: check for docker / pulumi token before erroring out later in script

[qdzlug]

Describe the bug
We should do this check up front, rather than waiting until the user hits the errors.

To Reproduce
Steps to reproduce the behavior:

1. Deploy without docker installed.

2. Blows up at KIC pull.

3. Deploy without pulumi token

4. Blows up at first invocation of pulumi.

Expected behavior
Check and inform the user how to fix.

Your environment
None

Additional context
None