build(ci): add support for PR labeler

Closes: MILK-35

.github/labeler.yml

@@ -0,0 +1,33 @@
+"x/services":
+  - changed-files:
+    - any-glob-to-any-file: x/services/**/*
+"x/operators":
+  - changed-files:
+    - any-glob-to-any-file: x/operators/**/*
+"x/pools":
+  - changed-files:
+    - any-glob-to-any-file: x/pools/**/*
+"x/restaking":
+  - changed-files:
+    - any-glob-to-any-file: x/restaking/**/*
+"x/client":
+  - changed-files:
+    - any-glob-to-any-file: client/**/*
+    - any-glob-to-any-file: x/*/client/**/*
+"kind/build":
+  - changed-files:
+    - any-glob-to-any-file: Makefile
+    - any-glob-to-any-file: Dockerfile
+    - any-glob-to-any-file: docker-compose.yml
+    - any-glob-to-any-file: scripts/*
+"kind/ci":
+  - changed-files:
+    - any-glob-to-any-file: .github/**/*.yml
+    - any-glob-to-any-file: buf.yaml
+    - any-glob-to-any-file: .mergify.yml
+    - any-glob-to-any-file: .golangci.yml
+    - any-glob-to-any-file: .github/dependabot.yml
+    - any-glob-to-any-file: .github/labeler.yml
+"kind/adr":
+  - changed-files:
+    - any-glob-to-any-file: docs/architecture/**/*

.github/workflows/labeler.yml

@@ -0,0 +1,16 @@
+name: "Pull Request Labeler"
+on:
+  - pull_request_target
+
+jobs:
+  Labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Apply PR labels 🏷️
+        uses: actions/labeler@v5
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          sync-labels: true