Add info on ENABLE_SHA1 flag on cache and origin containers (SOFTWARE-5809)

[matyasselmeci]

These are the two places I could find to add the info on the ENABLE_SHA1 flag. The documentation for running a hosted CE is elsewhere; Frontier-Squids I assume don't use grid certs for auth; we don't have an XRootD-Standalone image; ENABLE_SHA1 doesn't work on the EP containers (because they don't run as root and you need root to run update-crypto-policy).

There are numerous non-containerized services where a blurb mentioning EL9 and update-crypto-policy might be useful, though, but that should be a separate PR (and perhaps ticket).

[brianhlin]

We do have an xrootd-standalone image. Does anybody use it? 🤷🏽

The documentation for running a hosted CE is elsewhere

I don't think this is necessary for a CE since we use LE + tokens

There are numerous non-containerized services where a blurb mentioning EL9 and update-crypto-policy might be useful, though, but that should be a separate PR (and perhaps ticket).

Agreed. I've been a bit hesitant on this because it feels like something people will set and forget.

[brianhlin]

Tagging in @mwestphall for the review

[matyasselmeci]

We do have an xrootd-standalone image. Does anybody use it? 🤷🏽

Well, it's not documented in this repository at least :)

As a side note the xrootd-standalone docs have not been updated for OSG 23 yet.

[mwestphall]

LGTM