Switched to actions/labeler for PR labeling

fixes https://github.com/TryGhost/DevOps/issues/111

- this allows us to add labels based upon the contents in a smarter way
  than the previous workflow

.github/labeler.yml

@@ -0,0 +1,7 @@
+'affects:i18n':
+  - 'ghost/i18n/**'
+'affects:admin':
+  - 'ghost/admin/**'
+  - 'apps/admin-x-**'
+'affects:portal':
+  - 'apps/portal/**'

.github/workflows/i18n.yml

@@ -1,21 +0,0 @@
-name: i18n check
-on:
-  pull_request_target:
-    types: [opened]
-    paths:
-      - 'ghost/i18n/locales/**'
-jobs:
-  create-label:
-    runs-on: ubuntu-latest
-    if: github.repository_owner == 'TryGhost'
-    name: Add i18n label
-    steps:
-      - uses: actions/github-script@v6
-        with:
-          script: |
-            github.rest.issues.addLabels({
-              issue_number: context.issue.number,
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              labels: ["i18n"]
-            })

.github/workflows/labeler.yml

@@ -0,0 +1,11 @@
+name: PR labeler
+on:
+  - pull_request_target
+jobs:
+  triage:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v4