Fix project auto-assignment closing not merged PRs (#7128)

* Fix project assignment on closed PRs not merged

* Minor change

* Don't execute labeler on closed PRs

* Fix column name

.github/workflows/add-labels-priority.yml

@@ -1,11 +1,12 @@
 name: Add Pull Request Labels and Assign to Project
 on:
   pull_request_target:
-    types: [opened]
+    types: [opened, closed]
 
 jobs:
   triage:
     runs-on: ubuntu-latest
+    if: github.event.action == 'opened'
     steps:
       - uses: ericcornelissen/labeler@label-based-on-status
         with:
@@ -14,6 +15,7 @@ jobs:
   assign-to-project:
     runs-on: ubuntu-latest
     name: Assign to Project
+    if: github.event.action == 'opened'
     needs: triage
     env:
       MY_GITHUB_TOKEN: ${{ secrets.AUTO_ASSIGN_WORKFLOW_TOKEN }}
@@ -76,3 +78,19 @@ jobs:
         with:
           project: https://github.com/orgs/simple-icons/projects/2
           column_name: Unprioritised
+
+  unassign-from-project:
+    runs-on: ubuntu-latest
+    name: Unassign from Project
+    if: |
+      github.event.action != 'opened' &&
+      github.event.pull_request.merged == false
+    needs: triage
+    env:
+      MY_GITHUB_TOKEN: ${{ secrets.AUTO_ASSIGN_WORKFLOW_TOKEN }}
+    steps:
+      - name: Assign closed pull requests to "Completed or Abandoned"
+        uses: srggrs/assign-one-project-github-action@1.3.1
+        with:
+          project: https://github.com/orgs/simple-icons/projects/2
+          column_name: Completed or Abandoned