feat(ci): add labeler

relates to STACKITSDK-217

Author: rubenhoenle

.github/workflows/labeler.yaml

@@ -0,0 +1,26 @@
+name: "Labeler"
+on:
+  pull_request:
+    types: [opened, synchronize]
+  workflow_dispatch:
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+    name: "Labeler"
+    runs-on: ubuntu-latest
+    steps:
+      # Re-uses the labeler config from the Go SDK, so we only need to maintain one single config file
+      - name: Checkout STACKIT Go SDK
+        uses: actions/checkout@v6
+        with:
+          repository: "stackitcloud/stackit-sdk-go"
+          ref: "feat/labeler" # TODO: remove this line before merge!
+      - name: Labeler action
+        uses: actions/labeler@v6
+        with:
+          configuration-path: 'stackit-sdk-go/.github/labeler.yml'
+          sync-labels: false