Flatcar is in the NIST CPE dictionary. Let's programmatically build the
`CPE_NAME` in the build process in order to be scanned.
`CPE_NAME` is part of `/etc/os-release` with the following manual entry:
```
CPE_NAME=
A CPE name for the operating system, in URI binding syntax, following the Common Platform Enumeration Specification[2] as proposed by the NIST.
This field is optional. Example: "CPE_NAME="cpe:/o:fedoraproject:fedora:17""
...
[^2]: Common Platform Enumeration Specification
http://scap.nist.gov/specifications/cpe/
```
Which indicates that the current version of CPE is 2.3.
Closes: https://github.com/flatcar-linux/Flatcar/issues/536
Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
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