removes init $PATH checks from trustore_linux.go

Inspecting the PATH is not reliable since it can change when running
sudo.

Closes #23

[action] Remove gitleaks secret from code-scan-cron

- Add smallstep/core to codeowners file

Bump howett.net/plist from 0.0.0-20181124034731-591f970eefbb to 1.0.0

[action] remove gitleaks

Bumps [howett.net/plist](https://github.com/DHowett/go-plist) from 0.0.0-20181124034731-591f970eefbb to 1.0.0.
- [Release notes](https://github.com/DHowett/go-plist/releases)
- [Commits](https://github.com/DHowett/go-plist/commits/v1.0.0

)

---
updated-dependencies:
- dependency-name: howett.net/plist
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

linting & continuous integration

truststore_linux: Add support for SUSE13 and upwards

Signed-off-by: Josef Johansson <josef@oderland.se>

Add Solus OS support

Fix FreeBSD builds

Followup to https://github.com/smallstep/truststore/pull/7#issuecomment-988544551

Add FreeBSD `certctl` support (Fixes #1)

Fix check for $JAVA_HOME