Enable building of Ubuntu/arm crossarch components in netci

[echesakov]

@BruceForstall Do you think it's safe now to enable building crosscomponents for Ubuntu arm (which automatically enables R2R crossgen-ing of S.P.C.dll before tests running)? FYI, I rebased dev/unit_test_workflow to include #17342 changes.

#17274 Innerloop is green and just one pri1 test failed during Normal (Loader/binding/assemblies/assemblybugs/177066w/repro177066/repro177066.sh).

/cc @RussKeldorph

[jashook]

@echesakovMSFT the failures seem interesting. Also @BruceForstall the build timed out running the tests is this change slowing down test runs, or do these jobs run at the timeout threshold normally.

[jashook]

On a second look through it looks like there may be a bug? The test run seems to spend a 3+ hours on something.

13:58:42          - JIT/superpmi/superpmicollect/superpmicollect.sh
16:59:05 
Build timed out (after 240 minutes). Marking the build as aborted.
16:59:05 
Build was aborted
16:59:05 [Current build status] check if current [ABORTED] is worse or equals then [SUCCESS] and better or equals then [SUCCESS]
16:59:05 Run condition [Current build status] preventing perform for step [[Archive the artifacts]]
16:59:05 [xUnit] [INFO] - Starting to record.
16:59:05 [xUnit] [INFO] - Processing xUnit.Net-v2 (default)
16:59:06 FAILED   - Interop/ArrayMarshalling/ByValArray/MarshalArrayByValTest/MarshalArrayByValTest.sh
16:59:06      

[BruceForstall]

The changes look fine to me IF the tests all pass.

Currently, though, it looks like the tests DON'T all pass. It's worrisome that repro177066.sh fails 20 times in a row. At a minimum, we would need to disable this test and open an issue to track. There are quite a few other tests that fail many times but not every time. That's worrisome, but that's pretty common unfortunately right now.

[BruceForstall]

@jashook what job are you looking at? The clip you show makes it look like the superpmicollect test is hanging.

[jashook]

I was under the impression that these tests only echo after finishing, I may be reading runtests.sh wrong. Either way, you can see the log here: https://ci.dot.net/job/dotnet_coreclr/job/master/job/arm_cross_checked_ubuntu_innerloop_tst_prtest/199/console

[BruceForstall]

I was under the impression that these tests only echo after finishing

Ah, right.

[BruceForstall]

LGTM