allow opt-out of SSL installation

[msarahan]

I have an image that includes some enhanced-security packages to comply with FIPS regulations. When this common-utils feature tries to install libssl3, it conflicts, which looks like:

#30 13.02 Some packages could not be installed. This may mean that you have
#30 13.02 requested an impossible situation or if you are using the unstable
#30 13.02 distribution that some required packages have not yet been created
#30 13.02 or been moved out of Incoming.
#30 13.02 The following information may help to resolve the situation:
#30 13.02 
#30 13.02 The following packages have unmet dependencies:
[2025-09-19T04:52:06.272Z] #30 13.09  libssl3t64 : Breaks: libssl3 (< 3.0.13-0ubuntu3.5)
#30 13.10 E: Unable to correct problems, you have held broken packages.
#30 13.10 ERROR: Feature "Common Utilities" (ghcr.io/devcontainers/features/common-utils) failed to install! Look at the documentation at https://github.com/devcontainers/features/tree/main/src/common-utils for help troubleshooting this error.

It seems like installing SSL by default is probably helpful, but it would help a lot to add opt-out functionality.

[msarahan]

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