Merged PR 11: PD-41: Initial stab at service versioning.

PD-41: Initial stab at versioning.  This allows us to have services versioned major.minor.patch, with the major.minor portion controlled by a repo file (version.txt, so we can change it on branches etc) and the patch an automatic counter in Azure DevOps.

Some history of me trying to do this before (without yaml) on the last project:
microsoft/azure-pipelines-agent#1802

This is achieved with two jobs in the pipeline:
- one to read the file, exporting the majorMinor version as a variable
- the next job uses the majorMinor variable within a counter expression (so if the major minor version changes, the counter starts from zero again).  This job then has a step to set the build number.

src/Theta.Platform.UI.Instruments.API/version.txt

@@ -0,0 +1 @@
+0.0

src/Theta.Platform.UI.Orders.API/version.txt

@@ -0,0 +1 @@
+0.0

src/Theta.Platform.UI.Pricing.Streaming/version.txt

@@ -0,0 +1 @@
+0.0

src/azure-pipelines.yml

@@ -1,7 +1,3 @@
-pool:
-  vmImage: 'Ubuntu 16.04'
-
-
 variables:
   registryServerName: '$(registryName).azurecr.io'
   imageName: '$(projectName)'
@@ -20,37 +16,66 @@ trigger:
     # (see issue https://github.com/MicrosoftDocs/vsts-docs/issues/2691 raised on doc https://docs.microsoft.com/en-us/azure/devops/pipelines/build/triggers?view=vsts&tabs=yaml)
     # for now follow steps in docs/Azure-DevOps-Pipelines.md
 
-steps:
-- task: DotNetCoreCLI@2
-  displayName: 'run unit tests'
-  inputs:
-    command: test
-    projects: '**/$(projectNamePath).Tests/*.csproj'
+jobs:
+- job: versioning
+  pool:
+    vmImage: 'vs2017-win2016'
+  steps:
+  - powershell: $(system.defaultWorkingDirectory)/src/get-major-minor-version.ps1
+    name: setMajorMinorStep
+    displayName: 'read major minor'
+    workingDirectory: $(system.defaultWorkingDirectory)/src/$(projectNamePath)
+  - script: echo "The Major Minor Version is $(setvarStep.majorMinor)"
+    name: echoMajorMinorStep
+    displayName: 'echo major minor'
+
+- job: build
+  dependsOn: versioning
+
+  pool:
+    vmImage: 'Ubuntu 16.04'
+
+  variables:
+    majorMinor: $[dependencies.versioning.outputs['setMajorMinorStep.majorMinor']]
+    patch: $[counter(dependencies.versioning.outputs['setMajorMinorStep.majorMinor'])]
+
+  steps:
+  - bash: echo "The patch is $(patch)"
+    displayName: 'echo patch'
+
+  - bash: echo "##vso[build.updatebuildnumber]$(majorMinor).$(patch)"
+    displayName: 'update build number to major.minor.patch'
+
+  - task: DotNetCoreCLI@2
+    displayName: 'run unit tests'
+    inputs:
+      command: test
+      projects: '**/$(projectNamePath).Tests/*.csproj'
 
-- script: docker build -f $(projectNamePath)/Dockerfile -t $(registryServerName)/$(imageName):$(build.buildId) .
-  displayName: 'docker build'
-  workingDirectory: 'src'
+  - script: docker build -f $(projectNamePath)/Dockerfile -t $(registryServerName)/$(imageName):$(build.buildNumber) .
+    displayName: 'docker build'
+    workingDirectory: 'src'
 
-- bash: docker login $(registryServerName) -u $(registryLogin) -p $(registryPassword)
-  displayName: 'docker login'
+  - bash: docker login $(registryServerName) -u $(registryLogin) -p $(registryPassword)
+    displayName: 'docker login'
 
-- bash: |
-    docker push $(registryServerName)/$(imageName):$(build.buildId)
-  displayName: 'docker push'
-  condition: succeeded()
+  - bash: |
+      docker push $(registryServerName)/$(imageName):$(build.buildNumber)
+    displayName: 'docker push'
+    condition: succeeded()
 
-- task: HelmInstaller@0
-  displayName: 'Install Helm 2.11.0'
-  inputs:
-    helmVersion: 2.11.0
+  - task: HelmInstaller@0
+    displayName: 'Install Helm 2.11.0'
+    inputs:
+      helmVersion: 2.11.0
 
-- bash: helm init --client-only --wait
-  displayName: 'helm init'
+  - bash: helm init --client-only --wait
+    displayName: 'helm init'
 
-- bash: helm package --version $(build.buildId) --destination $(build.artifactStagingDirectory) $(projectNamePath)/charts/$(projectName)
-  displayName: 'helm package'
-  workingDirectory: 'src' 
+  - bash: helm package --version $(build.buildNumber) --destination $(build.artifactStagingDirectory) $(projectNamePath)/charts/$(projectName)
+    displayName: 'helm package'
+    workingDirectory: 'src' 
 
-- bash: az acr helm push -n $(registryName) -u $(registryLogin) -p $(registryPassword) $(build.artifactStagingDirectory)/$(projectName)-$(build.buildId).tgz
-  displayName: 'az acr helm push'
-  condition: succeeded()
+  - bash: az acr helm push -n $(registryName) -u $(registryLogin) -p $(registryPassword) $(build.artifactStagingDirectory)/$(projectName)-$(build.buildNumber).tgz
+    displayName: 'az acr helm push'
+    condition: succeeded()

src/get-major-minor-version.ps1

@@ -0,0 +1,2 @@
+$line = Get-Content -Path "version.txt" -TotalCount 1
+echo "##vso[task.setvariable variable=majorMinor;isOutput=true]$line"