Try to calculate the build number only once

azure-pipelines-windows-template.yml

@@ -10,10 +10,10 @@ parameters:
 
 jobs:
 - job: ${{ parameters.name }}
+  dependsOn: Initialization
   pool:
     vmImage: 'vs2017-win2016'
   steps:
-  - template: azure-pipelines-build-number.yml
   - script: |
       pip install aqtinstall
       mkdir C:\Qt

azure-pipelines.yml

@@ -5,11 +5,15 @@ trigger:
 - develop
 
 jobs:
+- job: Initialization
+  pool: Default
+  steps:
+  - template: azure-pipelines-build-number.yml
 - job: Linux
+  dependsOn: Initialization
   pool:
     vmImage: 'ubuntu-16.04'
   steps:
-  - template: azure-pipelines-build-number.yml
   - script: |
       sudo add-apt-repository 'deb http://download.opensuse.org/repositories/home:/selmf/xUbuntu_16.04/ /'
       sudo add-apt-repository ppa:kubuntu-ppa/backports
@@ -40,12 +44,12 @@ jobs:
       path: $(Build.ArtifactStagingDirectory)
       artifactName: src $(Build.BuildNumber) tarball
 - job: MacOS
+  dependsOn: Initialization
   variables:
   - group: macos-codesign
   pool:
     vmImage: 'macOS-10.14'
   steps:
-  - template: azure-pipelines-build-number.yml
   - script: |
       brew install qt
       brew link qt --force
@@ -112,7 +116,6 @@ jobs:
   pool:
     vmImage: 'ubuntu-16.04'
   steps:
-    - template: azure-pipelines-build-number.yml
     - task: DownloadPipelineArtifact@2
       inputs:
         buildType: 'current'