Enable Pull Request Opened action to assign PRs to their creator

.github/disabled-workflows/pull_request_opened.yml

@@ -1,26 +0,0 @@
-# This workflow runs whenever a new pull request is created
-# TEMPORARILY DISABLED. Unfortunately this doesn't work for PRs created from forked repositories (which is how we tend to create PRs).
-# There is no known workaround yet. See https://github.community/t/how-to-use-github-token-for-prs-from-forks/16818
-name: Pull Request opened
-
-# Only run for newly opened PRs against the "main" branch
-on: 
-  pull_request:
-    types: [opened]
-    branches: 
-      - main
-
-jobs:
-  automation:
-    runs-on: ubuntu-latest
-    steps:
-    # Assign the PR to whomever created it. This is useful for visualizing assignments on project boards
-    # See https://github.com/marketplace/actions/pull-request-assigner
-    - name: Assign PR to creator
-      uses: thomaseizinger/assign-pr-creator-action@v1.0.0
-      # Note, this authentication token is created automatically
-      # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-      # Ignore errors. It is possible the PR was created by someone who cannot be assigned
-      continue-on-error: true

.github/workflows/pull_request_opened.yml

@@ -0,0 +1,24 @@
+# This workflow runs whenever a new pull request is created
+name: Pull Request opened
+
+# Only run for newly opened PRs against the "main" or maintenance branches
+# We allow this to run for `pull_request_target` so that github secrets are available
+# (This is required to assign a PR back to the creator when the PR comes from a forked repo)
+on:
+  pull_request_target:
+    types: [ opened ]
+    branches:
+      - main
+      - 'dspace-**'
+
+permissions:
+  pull-requests: write
+
+jobs:
+  automation:
+    runs-on: ubuntu-latest
+    steps:
+    # Assign the PR to whomever created it. This is useful for visualizing assignments on project boards
+    # See https://github.com/toshimaru/auto-author-assign
+    - name: Assign PR to creator
+      uses: toshimaru/auto-author-assign@v1.6.2