[QUESTION] Can I use HTTPS proxy from self-hosted runner ?

[isldj]

Question

Current runner version: '2.284.0'
OCP 4.11.33

The self-hosted Github runners are not working after we have moved our OCP cluster behind a whitelisted proxy.
I have configure the proxy env variables following https://docs.github.com/en/actions/hosting-your-own-runners/using-a-proxy-server-with-self-hosted-runners

but I get an error when I include the HTTPS_PROXY variable saying "Only the 'http' scheme is allowed for proxies."
According to the examples in the documentation I can use HTTPS_PROXY but with HTTP protocol,
Is it true that we can only use HTTP protocol?
For our case the HTTP is not allowed, so have to use HTTPS.
When I configure it with Socks5 URL it also through an error saying “forbidden”

Any ideas how can I solve this ?