fix(updater): Select first matching main branch

CHANGELOG.md

@@ -8,6 +8,10 @@
 - Validate PR - Skip validation for PRs with fewer than 100 lines changed, excluding common lock files (`Cargo.lock`, `yarn.lock`, `package-lock.json`, `Pipfile.lock`, etc.). Tiny PRs no longer go through the issue-discussion loop.
 - Add validate-pr composite action for validating non-maintainer PRs against contribution guidelines ([#153](https://github.com/getsentry/github-workflows/pull/153))
 
+### Fixes
+
+- Updater - Select the first branch when multiple branches point at `HEAD` ([#165](https://github.com/getsentry/github-workflows/pull/165))
+
 ## 3.3.0
 
 ### Features

updater/scripts/update-dependency.ps1

@@ -162,7 +162,7 @@ if ("$Tag" -eq '') {
         if ("$headRef" -eq '') {
             throw "Couldn't determine repository head (no ref returned by ls-remote HEAD"
         }
-        $mainBranch = (git ls-remote --heads $url | Where-Object { $_.StartsWith($headRef) }) -replace '.*\srefs/heads/', ''
+        $mainBranch = (git ls-remote --heads $url | Where-Object { $_.StartsWith($headRef) } | Select-Object -First 1) -replace '.*\srefs/heads/', ''
     }
 
     $url = $url -replace '\.git$', ''

updater/tests/update-dependency.Tests.ps1

@@ -220,7 +220,7 @@ switch ($action)
                 $output | Should -Contain 'latestTag=0.28.0'
                 $output | Should -Contain 'latestTagNice=v0.28.0'
                 $output | Should -Contain 'url=https://github.com/getsentry/sentry-cli'
-                $output | Should -Contain 'mainBranch=master'
+                $output | Should -Contain 'mainBranch=main'
             }
         }