IHAC where the injected Proxy Env Variables into the Build pod are causing the build to fail. Unfortunately, the build contains a build step by external binary which complains about the proxy not in the right format. (the assumption is that once env variable is configured, it expects some format like "http{s}" or domain, etc).

Note that cluster runs without any configured Proxy, so builds should not use any proxy.

We also see that the fix from the bug below introduced the issue as it was working in 4.15 and no longer works in 4.16 (seems like the external binary ignored the upper case variables)
https://issues.redhat.com/browse/OCPBUGS-12699 
    

OpenShift 4.16.37
    

on currently failing environment
    

the build fails with external binary complaining about the format
    

proxy variables should be excluded
    

Additional question is why those variables are injected, if they are not used?

The BuildConfig doesn't have any ENV configured about the Proxy.
Even setting the env variables through the BuildConfig will result that the variable is added but no value is added.

////
    - name: HTTP_PROXY
    - name: http_proxy
    - name: HTTPS_PROXY
    - name: https_proxy
    - name: NO_PROXY
    - name: no_proxy
///