Add handling of custom ssl certs in urllib ops (#42953)

This PR allows the user to specify a path to a custom cert file (or directory) in
Spack's config:

```yaml
  # This is where custom certs for proxy/firewall are stored.
  # It can be a path or environment variable. To match ssl env configuration
  # the default is the environment variable SSL_CERT_FILE
  ssl_certs: $SSL_CERT_FILE
```

`config:ssl_certs` can be a path to a file or a directory, or it can be and environment
variable that resolves to one of those. When it posts to something valid, Spack will
update the ssl context to include custom certs, and fetching via `urllib` and `curl`
will trust the provided certs.

This should resolve many issues with fetching behind corporate firewalls.


---------

Co-authored-by: psakievich <psakievich@users.noreply.github.com>
Co-authored-by: Alec Scott <alec@bcs.sh>

0 files changed, 0 insertions, 0 deletions