[issue35683] Enable manylinux1 builds on Pipelines

[Steve Dower]

New submission from Steve Dower <steve.dower at python.org>:

Azure Pipelines can now support container jobs: https://docs.microsoft.com/en-us/azure/devops/pipelines/process/container-phases?view=vsts&tabs=yaml

I experimented with enabling a manylinux1 build a while back, which should now be able to use identical steps to the POSIX build. With the new syntax, we can enable CI (and perhaps PR?) builds using the snippet below:

- job: ManyLinux1_CI_Tests
  displayName: ManyLinux1 CI Tests
  dependsOn: Prebuild
  condition: |
    and(
        and(
            succeeded(),
            eq(variables['manylinux'], 'true')
        ),
        eq(dependencies.Prebuild.outputs['tests.run'], 'true')
    )

  resources:
    containers:
    - container: manylinux1
      image: dockcross:manylinux-x64

  pool:
    vmImage: ubuntu-16.04

  container: manylinux1

  variables:
    testRunTitle: '$(build.sourceBranchName)-manylinux1'
    testRunPlatform: manylinux1

  steps:
  - template: ./posix-steps.yml


I don't have time right now to test this change, but someone else might. It's certainly going to be easier for someone to test it by adding this to the PR build first (or set up a build on your own Pipelines instance).

Maybe there are other more relevant containers we should be testing in?

----------
components: Cross-Build
messages: 333209
nosy: Alex.Willmer, barry, steve.dower, zach.ware
priority: normal
severity: normal
status: open
title: Enable manylinux1 builds on Pipelines
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35683>
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