Vib plugin that sets up fsguard and generates a filelist.

This plugin requires that minisign is installed in the image, this can be easily done with a nested module

- name: fsguard
  type: fsguard
  CustomFsGuard: false
  FsGuardLocation: "/usr/bin/"
  GenerateKey: true
  FilelistPaths: ["/usr/bin/"]
  modules:
    - name: minisign
      type: apt
      sources:
        packages:
            - "minisign"

If GenerateKey is set to false, KeyPath has to be specified, pointing to a location in the container (e.g. added through includes.container) which contains already existing minisign keys:

- name: fsguard
  type: fsguard
  CustomFsGuard: false
  FsGuardLocation: "/usr/bin/"
  GenerateKey: false
  KeyPath: "/etc/minisign/"
  FilelistPaths: ["/usr/bin/"]
  modules:
    - name: minisign
      type: apt
      sources:
        packages:
            - "minisign" 

Note that the keys must be named minisign.pub (public) and minisign.key (private) in this example the minisign keys would be in includes.container/etc/minisign/, which translates to `/etc/minisign** in the build environment

Keep in mind that the minisign key cannot be password protected, as there is no way for the user to type in the password during building (which is why always generting a random key through GenerateKey is recommended)

In the case that FsGuard has to be manually built (due to a configuration change or similiar), the CustomFsGuard option has to be set to True, this stops the module from fetching a prebuilt FsGuard and instead allows the user to manually build FsGuard, it does however expect the FsGuard binary to be at /sources/FsGuard