Bump version to 2.0.0-beta.4 and scope external-release pipeline to main only (#1793)

* Bump version from 2.0.0-beta.3 to 2.0.0-beta.4

Triggers the external-release ADO pipeline on merge to main, which
will publish Microsoft.Garnet 2.0.0-beta.4 and garnet-server 2.0.0-beta.4
to NuGet.org and create GitHub Release v2.0.0-beta.4.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Scope external-release pipeline to main only (drop dev)

Removes the dev branch path from the v2 release pipeline:
- trigger.branches.include: drop 'dev', keep only 'main'
- GitHubRelease/NuGet push conditions: simplified from or(main,dev)
  to a single eq on Build.SourceBranch == refs/heads/main
- Drop the releaseTitle powershell shim and 'isPreRelease' flag
  (only mattered when dev was producing PREVIEW releases)

dev pushes will no longer trigger the external release pipeline.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Auto-derive GitHubRelease isPreRelease from version string

Adds a powershell step right after extract_version.ps1 that sets a
pipeline variable 'isPreRelease' = true when Build.BuildNumber
contains a '-' (i.e., a SemVer prerelease label like '-beta.4').

GitHubRelease@1 now consumes 'isPreRelease: $(isPreRelease)' so:
- 2.0.0-beta.x  -> prerelease=true (does NOT become 'Latest')
- 2.0.0 (GA)    -> prerelease=false (becomes 'Latest')
- 1.1.x patches -> prerelease=false

No future maintenance needed when v2 GA ships.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Auto-derive GitHubRelease title PREVIEW prefix from version string

Extends the powershell shim that already sets 'isPreRelease' to also
set 'releaseTitle' = 'Garnet PREVIEW v$(Build.BuildNumber)' when the
version is a SemVer prerelease (contains '-'), else 'Garnet v...'.

GitHubRelease@1 now consumes 'title: $(releaseTitle)'. Net effect:
- 2.0.0-beta.x  -> 'Garnet PREVIEW v2.0.0-beta.x' + prerelease=true
- 2.0.0 (GA)    -> 'Garnet v2.0.0'                + prerelease=false
- 1.1.x patches -> 'Garnet v1.1.x'                 + prerelease=false

Restores naming consistency with prior PREVIEW beta releases
(v2.0.0-beta.{1,2,3}) without re-introducing branch-based logic.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: badrishc

.azure/pipelines/azure-pipelines-external-release.yml

@@ -8,7 +8,6 @@ trigger:
   branches:
     include:
     - main
-    - dev
   paths:
     include:
     - Version.props
@@ -67,6 +66,18 @@ jobs:
       filePath: .azure/pipelines/extract_version.ps1
       workingDirectory: .azure/pipelines
 
+  - powershell: |
+      $isPreRelease = "$(Build.BuildNumber)".Contains('-')
+      if ($isPreRelease) {
+        $releaseTitle = "Garnet PREVIEW v$(Build.BuildNumber)"
+      } else {
+        $releaseTitle = "Garnet v$(Build.BuildNumber)"
+      }
+      Write-Host "Build.BuildNumber=$(Build.BuildNumber); isPreRelease=$isPreRelease; releaseTitle=$releaseTitle"
+      Write-Host "##vso[task.setvariable variable=isPreRelease]$($isPreRelease.ToString().ToLower())"
+      Write-Host "##vso[task.setvariable variable=releaseTitle]$releaseTitle"
+    displayName: 'Derive isPreRelease and releaseTitle from version (PREVIEW prefix iff SemVer prerelease)'
+
   - task: UseDotNet@2
     displayName: Use .NET 6 SDK - needed for code signing
     inputs:
@@ -208,20 +219,9 @@ jobs:
   - task: PublishBuildArtifacts@1
     displayName: 'Publish Artifact: drop'
 
-  - powershell: |
-      if ("$(Build.SourceBranchName)" -eq "main") {
-        Write-Host "##vso[task.setvariable variable=releaseTitle]Garnet v$(Build.BuildNumber)"
-      } else {
-        Write-Host "##vso[task.setvariable variable=releaseTitle]Garnet PREVIEW v$(Build.BuildNumber)"
-      }
-    displayName: 'Set releaseTitle variable'
-
   - task: GitHubRelease@1
     displayName: 'Create the GitHub release'
-    condition: or(
-        eq(variables['Build.SourceBranchName'], 'main'),
-        eq(variables['Build.SourceBranchName'], 'dev')
-      )
+    condition: eq(variables['Build.SourceBranch'], 'refs/heads/main')
     inputs:    
       action: 'create'
       gitHubConnection: ADO_to_Github_ServiceConnection
@@ -244,14 +244,11 @@ jobs:
         $(Build.ArtifactStagingDirectory)/*.zip
         $(Build.ArtifactStagingDirectory)/*.tar.xz
         $(Build.ArtifactStagingDirectory)/*.7z
-      isPreRelease: ${{ eq(variables['Build.SourceBranchName'], 'dev') }}
+      isPreRelease: $(isPreRelease)
 
   - task: NuGetCommand@2
     displayName: 'Push both packages to NuGet.org'
-    condition: or(
-        eq(variables['Build.SourceBranchName'], 'main'),
-        eq(variables['Build.SourceBranchName'], 'dev')
-      )
+    condition: eq(variables['Build.SourceBranch'], 'refs/heads/main')
     inputs:
       command: push
       packagesToPush: '$(Build.ArtifactStagingDirectory)/**/*.nupkg'

Version.props

@@ -1,6 +1,6 @@
 <Project>
 	<!-- VersionPrefix property for builds and packages -->
 	<PropertyGroup>
-		<VersionPrefix>2.0.0-beta.3</VersionPrefix>
+		<VersionPrefix>2.0.0-beta.4</VersionPrefix>
 	</PropertyGroup>
 </Project>