Podman often has to run behind an http/https proxy, often in corporate environments.
This proxy may or may not include SSL inspection capabilities, requiring a trusted SSL CA certificate to be added to a system's trust store.
Solve this by reading standard proxy variables (HTTP_PROXY HTTPS_PROXY NO_PROXY http_proxy https_proxy no_proxy) and injecting them into the machine at init.
[NO NEW TESTS NEEDED]
Signed-off-by: Aditya Rajan <arajan@redhat.com>