[Bug]: cannot install certs on debian

[ju1ius]

Hi,

Steps to Reproduce

1. The step CLI is installed locally from the latest debian package
2. A private CA is running from a docker container using the official image:

   $ step ca health --ca-url=https://localhost:9000
   ok

3. Running the following command:

   $ step ca bootstrap --ca-url=https://localhost:9000 --fingerprint <ca-fingerprint> --install

   Produces the following output:

   The root certificate has been saved in /home/<user>/.step/certs/root_ca.crt.
   The authority configuration has been saved in /home/<user>/.step/config/defaults.json.
   Installing the root certificate in the system truststore...
   install is not supported on this system
   

4. Running the following command:

   $ step certificate install /home/<user>/.step/certs/root_ca.crt

   Produces the following output:

   failed to install /home/<user>/.step/certs/root_ca.crt: install is not supported on this system
   

Your Environment

• OS - Debian Sid
• step CLI Version - 0.25.0

Expected Behavior

The root CA certificate should be installed in the specified trustores.

Actual Behavior

Installation fails.

Additional context

Using the step cli built from source from the master branch yields the same results.

FWIW, mkcert has no problem installing certs on this machine.

See also: smallstep/truststore#23

[maraino]

This should be fixed by #1053