refactor azure to specify BUILD_COMMIT once, not twice

Author: mattip

README.rst

@@ -58,7 +58,7 @@ where user is the ``ANACONDA_ORG`` value in the ``yml`` files.
 Triggering a build
 ==================
 
-You will likely want to edit the ``azure/*`` files to
+You will likely want to edit the ``azure-pipelines.yml`` files to
 specify the ``BUILD_COMMIT`` before triggering a build - see below.
 
 You will need write permission to the github repository to trigger new builds.
@@ -75,7 +75,7 @@ Which numpy commit does the repository build?
 
 PRs merged to this repo from a fork, and commits directly pushed to this repo
 will build the commit specified in the ``BUILD_COMMIT`` at the top of the
-``azure/windows.yml`` and ``azure/posix.yml`` files, the wheels will be
+``azure-pipelines.yml`` file, the wheels will be
 uploaded to https://anaconda.org/multibuild-wheels-staging/numpy. The
 ``NIGHTLY_BUILD_COMMIT`` is built once a week (sorry for the misnomer),
 and uploaded to https://anaconda.org/scipy-wheels-nightly/.

azure-pipelines.yml

@@ -13,6 +13,9 @@ trigger:
 pr:
 - master 
 
+variables:
+  BUILD_COMMIT: "master"
+
 jobs:
   - template: azure/windows.yml
     parameters:

azure/posix.yml

@@ -9,7 +9,6 @@ jobs:
       vmImage: ${{ parameters.vmImage }}
     variables:
       REPO_DIR: "numpy"
-      BUILD_COMMIT: "master"
       PLAT: "x86_64"
       CYTHON_BUILD_DEP: "cython==0.29.16"
       NIGHTLY_BUILD_COMMIT: "master"

azure/windows.yml

@@ -8,7 +8,6 @@ jobs:
     pool:
       vmImage: ${{ parameters.vmImage }}
     variables:
-      BUILD_COMMIT: "master"
       NIGHTLY_BUILD_COMMIT: "master"
       JUNITXML: "test-data.xml"
       TEST_DIR: '$(Agent.WorkFolder)/tmp_for_test'