Update Alpine version for libraries pipeline

[liveans]

Removing EOL Alpine 3.16 from pipeline (image already deleted: dotnet/dotnet-buildtools-prereqs-docker#1078)
Adding Alpine 3.17 for normal runs and 3.20 for extra-platforms to pipeline

/cc @ManickaP

[CarnaViire]

@liveans

note that the standard test CI will not test the 3.20 addition, it only runs for extra-platforms pipeline (isExtraPlatformsBuild=true) or for outerloop on main branch rolling build or some other specially configured pipelines (includeAllPlatforms=true) -- note the conditions:

- ${{ if or(eq(parameters.jobParameters.isExtraPlatformsBuild, true), eq(parameters.jobParameters.includeAllPlatforms, true)) }}:

and

- ${{ if and(eq(parameters.platform, 'linux_musl_arm64'), or(eq(parameters.jobParameters.isExtraPlatformsBuild, true), eq(parameters.jobParameters.includeAllPlatforms, true))) }}:

[liveans]

@liveans

note that the standard test CI will not test the 3.20 addition, it only runs for extra-platforms pipeline (isExtraPlatformsBuild=true) or for outerloop on main branch rolling build or some other specially configured pipelines (includeAllPlatforms=true) -- note the conditions:

- ${{ if or(eq(parameters.jobParameters.isExtraPlatformsBuild, true), eq(parameters.jobParameters.includeAllPlatforms, true)) }}:

and

- ${{ if and(eq(parameters.platform, 'linux_musl_arm64'), or(eq(parameters.jobParameters.isExtraPlatformsBuild, true), eq(parameters.jobParameters.includeAllPlatforms, true))) }}:

Thanks for the note @CarnaViire, I'm aware of it, but I tried to keep 1 version style for normal runs as we used to have before here.

[CarnaViire]

There are (at least were) "hacks" to check stuff like this without having to run extra-platforms which is super expensive; let me find a PR where I was in a similar situation

[CarnaViire]

#94609, namely this commit (that must be reverted after CI runs): 63b8302 -- which basically trims the whole pipeline to a single leg execution exactly on the needed distro @liveans

[CarnaViire]

Thanks for the note @CarnaViire, I'm aware of it, but I tried to keep 1 version style for normal runs as we used to have before here.

I'm not saying you need to change anything (in the "final form" of the PR), I just want the distro to be verified before the PR is merged (and potentially become a noise in outerloops and extra-platforms)

[liveans]

Tests are passing on all 3 alpine versions. Reverted change back and ready to review.

/cc @CarnaViire

[CarnaViire]

LGTM

[carlossanlop]

Do we need to backport this to 8.0 and/or 6.0?

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[liveans]

Do we need to backport this to 8.0 and/or 6.0?

I'm not sure about the infra perspective here, but we don't need this PR in 8.0/6.0 for now, as far as I know.

/cc @ManickaP