Creating dedicated release pipeline

[skip ci]

release-branch-pipeline.yml

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+trigger:
+- release
+
+pr: none
+
+pool:
+  vmImage: "ubuntu-16.04"
+
+variables:
+  VERSION:
+
+steps:
+  # This task pulls the <version> value from the org.hl7.fhir.r5 project pom.xml file. All modules are released as 
+  # the same version, at the same time, as defined in the root level pom.xml.
+  - task: PowerShell@2
+    inputs:
+      targetType: 'inline'
+      script: |
+        [xml]$pomXml = Get-Content -Path .\pom.xml
+        # version
+        Write-Host $pomXml.project.version
+        $version=$pomXml.project.version
+        Write-Host "##vso[task.setvariable variable=version]$version"
+
+  # Prints out the build version, for debugging purposes
+  - bash: echo Pulled version from pom.xml => $(version)
+
+  # Azure pipelines cannot pass variables between pipelines, but it can pass files, so we
+  # pass the build id (ex: 1.1.13-SNAPSHOT) as a string in a file. 
+  # This is used in the release pipeline, so we create it here.
+  - bash: |
+      echo $(version)
+      VERSION=$(version)
+      echo "$VERSION" > $(System.DefaultWorkingDirectory)/VERSION
+
+  # Copies the VERSION file containing the build id (ex: 1.1.13-SNAPSHOT) to the staging directory
+  # This is done for release versions only.
+  - task: CopyFiles@2
+    displayName: 'Copy Files to: $(build.artifactstagingdirectory)'
+    inputs:
+      SourceFolder: '$(System.Defaultworkingdirectory)'
+      Contents: "$(System.DefaultWorkingDirectory)/VERSION"
+      TargetFolder: '$(build.artifactstagingdirectory)'
+
+  # Runs 'mvn clean package'
+  - task: Maven@3
+    inputs:
+      mavenPomFile: 'pom.xml'
+      mavenOptions: '-Xmx3072m'
+      javaHomeOption: 'JDKVersion'
+      jdkVersionOption: '1.8'
+      jdkArchitectureOption: 'x64'
+      publishJUnitResults: true
+      testResultsFiles: '**/surefire-reports/TEST-*.xml'
+      goals: 'package'
+    
+  # Publishes the built Validator jar to build artifacts. Primarily for testing and debugging builds.
+  - task: PublishPipelineArtifact@1
+    displayName: 'Publish Validator jar'
+    inputs:
+      targetPath: "$(System.DefaultWorkingDirectory)/org.hl7.fhir.validation/target/org.hl7.fhir.validation-$(version).jar"
+      artifactName: Validator
+
+  # Publishes the files we've moved into the staging directory, so they can be accessed by the 
+  # release pipeline.
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish Build Artifacts'
+    inputs:
+      PathtoPublish: '$(build.artifactstagingdirectory)'