TST: Azure manylinux1 & clean-up

[tylerjereddy]

• remove some of the steps & comments
  from the original Azure yml template

• modify the trigger section to use
  develop since OpenBLAS primarily uses
  this branch; use the same batching
  behavior as downstream projects NumPy/
  SciPy

• remove Travis emulated ARMv6 gcc build
  because this now happens in Azure

• use documented Ubuntu vmImage name for Azure
  and add in a manylinux1 test run to the matrix
  for older glibc and catching things
  like memory.c invalid argument type in v0.3.6 #2104

[skip appveyor]

[martin-frbg]

Thanks. (I had already wondered why the default choice of the dormant "master" branch as the trigger appeared to work)

[martin-frbg]

Quick Q before I get tempted to mess with the azure file again - is it normal/intended that the Azure jobs show up as three individual lines in the github UI now (one for each individual job and one for the Azure task as such) ? I assume this is a byproduct of converting previous "script" steps to "jobs" ?

[tylerjereddy]

is it normal/intended that the Azure jobs show up as three individual lines in the github UI now (one for each individual job and one for the Azure task as such) ? I assume this is a byproduct of converting previous "script" steps to "jobs" ?

Yeah, we asked Microsoft about that downstream & they said the expanded list was working as intended. On balance, I think some maintainers didn't like the extra bloat in the immediate CI list, but it is 10 parallel jobs for open source so we live with it :)

And yes for adding jobs causing expansion of matrix you see right in GitHub. You can also add a matrix directive within a job for sub-expansion if you want like here: https://github.com/numpy/numpy/blob/master/azure-pipelines.yml#L120

That will also have the same effect on display.

[martin-frbg]

So this is just Microsoft trying to be different - it does look like unwanted extra bloat to me, but as long as the qemu jobs get their free 60 minutes of fame I can certainly live with it.