Add to your Azure Pipelines (VSTS) task for closing your `release` and `hotfix` branches as per GitFlow recommendations

process_gitflow.ps1

# Variables
$repoURL = "git@ssh.dev.azure.com:v3/example/example/example" # or "https://dev.azure.com/example/example/_git/example"
$sourceBranch = ("$env:BUILD_SOURCEBRANCH" -replace "refs/heads/")
$tagName = ($sourceBranch -replace ".*/(v.*)", '$1') # or $(Get-Date -Format yyy-MM-dd)
$userEmail = "email@example.com"
$userName = "Example"
Write-Host "##[debug] repoURL: $repoURL"
Write-Host "##[debug] sourceBranch: $sourceBranch"
Write-Host "##[debug] tagName: $tagName"
Write-Host "##[debug] userEmail: $userEmail"
Write-Host "##[debug] userName: $userName"

# Enhance logging of Git errors and create folder as working directory
Write-Host "##[debug] redirecting all Git output to Azure logs"
$env:GIT_REDIRECT_STDERR = '2>&1'
Write-Host "##[command] New-Item -Path $sourceBranch -ItemType Directory; Set-Location $sourceBranch"
New-Item -Path $sourceBranch -ItemType Directory; Set-Location $sourceBranch

# Checkout repository
Write-Host "##[command] git clone $repoURL ."
git clone $repoURL .
## if using Azure Repos then enable OAuth access on task and use the lines below
# Write-Host "##[command] git clone -c http.extraheader=`"AUTHORIZATION: bearer $env:SYSTEM_ACCESSTOKEN`" $repoURL ."
# git clone -c http.extraheader="AUTHORIZATION: bearer $env:SYSTEM_ACCESSTOKEN" $repoURL .

# Configure user details for Git commit
Write-Host "##[command] git config user.email `"$userEmail`""
git config user.email "$userEmail"
Write-Host "##[command] git config user.name `"$userName`""
git config user.name "$userName"

# Verify branch exists
$remoteBranches = (git branch -r).Trim().Split()
Write-Host "##[debug] remoteBranches:`n$remoteBranches"
if ($remoteBranches -notmatch $sourceBranch) {
    Write-Host "##[warning] skipping merge because '$sourceBranch' not found"
    Exit 0
}

# Merge into master and tag
Write-Host "##[command] git checkout master"
git checkout master
Write-Host "##[command] git merge --no-ff --no-edit origin/$sourceBranch"
git merge --no-ff --no-edit origin/$sourceBranch
Write-Host "##[command] git tag -m `"deployed $(Get-Date -Format yyy-MM-dd)`" $tagName"
git tag -m "deployed $(Get-Date -Format yyy-MM-dd)" $tagName
Write-Host "##[command] git push origin master"
git push origin master
Write-Host "##[command] git push origin $tagName"
git push origin $tagName

# Merge into develop or release(s)/hotfix(s)
$destinationRegex = "origin/((release|hotfix)/v[.0-9]+).*"
$remoteBranches = ($remoteBranches -replace $sourceBranch, 'ignore-current-branch')
if ($remoteBranches -notmatch $destinationRegex) {
    Write-Host "##[debug] git checkout develop"
    git checkout develop
    Write-Host "##[command] git merge --no-ff --no-edit origin/master"
    git merge --no-ff --no-edit origin/master
    Write-Host "##[command] git push origin develop"
    git push origin develop
}
else {
    Write-Host "##[debug] found release(s)/hotfix(s) branches, skipping 'develop'"
    foreach ($destinationBranch in $remoteBranches -match $destinationRegex) {
        $destinationBranch = ($destinationBranch -replace "origin/(.*)", '$1')
        Write-Host "##[command] git checkout $destinationBranch"
        git checkout $destinationBranch
        Write-Host "##[command] git merge --no-ff --no-edit origin/master"
        git merge --no-ff --no-edit origin/master
        Write-Host "##[command] git push origin $destinationBranch"
        git push origin $destinationBranch
    }
}

# Cleanup old branch
Write-Host "##[debug] deleting '$sourceBranch' from origin"
Write-Host "##[command] git push origin -d $sourceBranch"
git push origin -d $sourceBranch