Allow SSL certificate to be sourced at runtime from a Secret about httpd-container HOT 3 OPEN

Are the secrets available as files during the s2i assemble process? I'm not sure how this works.

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Hello @notroj
There is no build/s2i process involved here, I'm actually trying to avoid building a new image here, but rather use the httpd-container image directly (using registry.access.redhat.com/ubi8/httpd-24:latest) in my deployment.

Rationale for this is to keep binaries/images alignment between multiple clusters, and only provide specific runtime configuration on a per cluster basis using Secrets / ConfigMaps mounted at pod runtime.
(This requirement comes from our release process, involving testing in non-prod clusters and then deployment in multiple production clusters.)

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This is mostly the same issue as sclorg/s2i-php-container#369. Would you consider a pull request that adding this?

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