README:  add blurb about mounting in host certs
@@ -31,6 +31,14 @@ $ cd /srv/coreos
$ alias coreos-assembler='podman run --rm --net=host -ti --privileged --userns=host -v $(pwd):/srv --workdir /srv quay.io/cgwalters/coreos-assembler'
```
+If you need access to CA certificates on your host (for example, when you need to access
+a git repo that is not on the public Internet), you can mount in the host certificates
+as read-only. For example, on a Fedora host the alias would change to:
+
+`$ alias coreos-assembler='podman run --rm --net=host -ti --privileged --userns=host -v /etc/pki:/etc/pki:ro -v $(pwd):/srv --workdir /srv quay.io/cgwalters/coreos-assembler'`
+
+See this [Stack Overflow question](https://stackoverflow.com/questions/26028971/docker-container-ssl-certificates) for additional discussion.
+
Initializing
---
