diff --git a/.github/workflows/release-alpha.yml b/.github/workflows/pr-build.yml
similarity index 86%
rename from .github/workflows/release-alpha.yml
rename to .github/workflows/pr-build.yml
index 2a530697d..42e073d82 100644
--- a/.github/workflows/release-alpha.yml
+++ b/.github/workflows/pr-build.yml
@@ -1,17 +1,14 @@
-name: Alpha release
+name: PR Build
 
 on:
   pull_request:
-
-  workflow_dispatch:
+    types: [ labeled, synchronize, opened, reopened ]
 
 jobs:
   build:
-    # Don't run for forks as secrets are unavailable.
-    if: |
-      github.event.pull_request.head.repo.full_name == github.repository &&
-      (github.event_name == 'push' ||
-      (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'Trigger-PR-Build')))
+    # Only run for PRs that contain the trigger label. The action will fail for forks due to
+    # missing secrets, but there's no need to handle this as it won't run automatically.
+    if: contains(github.event.pull_request.labels.*.name, 'Trigger-PR-Build')
 
     name: Release
     runs-on: macos-12
diff --git a/changelog.d/pr-564.build b/changelog.d/pr-564.build
new file mode 100644
index 000000000..4d565ac56
--- /dev/null
+++ b/changelog.d/pr-564.build
@@ -0,0 +1 @@
+Update PR Build workflow triggers.
\ No newline at end of file