ci: check if the release is not already published before attempting to publish it (#600)

Author: Seddryck

DubUrl.sln

@@ -14,8 +14,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{95E83BA6
 		appveyor.yml = appveyor.yml
 		Directory.Build.props = Directory.Build.props
 		Directory.Build.targets = Directory.Build.targets
+		github.ps1 = github.ps1
 		GitVersion.yml = GitVersion.yml
-		github-actions.ps1 = github-actions.ps1
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Project", "Project", "{09BDFA96-353F-419D-890A-D9B9045E66DD}"

appveyor.yml

@@ -90,11 +90,14 @@ on_success:
         Owner = ($env:APPVEYOR_REPO_NAME -Split '/')[0]
         Repository = ($env:APPVEYOR_REPO_NAME -Split '/')[1]
         SecretToken = $env:github_access_token
-      } | Publish-Release `
+      } 
+      if ( -not ($context | Check-Release-Published -Tag "v$($env:GitVersion_SemVer)")) {
+        $context | Publish-Release `
             -Tag "v$($env:GitVersion_SemVer)" `
             -Name "$(($env:APPVEYOR_REPO_NAME -Split '/')[1]) $($env:GitVersion_SemVer)" `
             -ReleaseNotes `
             -DiscussionCategory 'Announcements'
+      }
     } else {
         Write-Host "No release published on GitHub."
     }

github.ps1

@@ -91,6 +91,29 @@ function Get-Commit-Associated-Pull-Requests {
 	return ($response.Content | ConvertFrom-Json).number 
 }
 
+function Check-Release-Published {
+    [CmdletBinding()]
+	Param(
+        [Parameter(Mandatory=$true, ValueFromPipeline = $true, Position=0 )]
+        [object] $context,
+		[Parameter(Mandatory=$true)]
+		[string] $tag
+	)
+	$response = Send-GitHub-Get-Request `
+					-Owner $context.Owner `
+					-Repository $context.Repository `
+					-Segments @('releases') `
+					-Headers $($context.SecretToken | Get-GitHub-Headers)
+	$existing = ($response.Content | ConvertFrom-Json) `
+					| ? {$_.tag_name -eq $tag}`
+					| Select-Object -Unique -ExpandProperty 'published_at'
+	if ($existing) {
+		Write-Host "Release already published at $existing"
+		return $true
+	}
+    return $false
+}
+
 function Post-Pull-Request-Labels {
     [CmdletBinding()]
 	Param(