ci: add auto labeling for PRs (#1046)

Signed-off-by: Moritz Wiesinger <moritz.wiesinger@dynatrace.com>

.github/labeler.yml

@@ -0,0 +1,23 @@
+documentation:
+  - docs/**/*
+  - "**/*.md"
+
+operator:
+  - operator/**/*
+
+scheduler:
+  - scheduler/**/*
+
+metrics-operator:
+  - metrics-operator/**/*
+
+cert-manager:
+  - klt-cert-manager/**/*
+
+ops:
+  - .github/**/*
+  - netlify.toml
+  - .markdownlint-cli2.yml
+
+helm:
+  - helm/**/*

.github/workflows/update-labels.yml

@@ -0,0 +1,15 @@
+name: Set PR Labels
+
+on:
+  pull_request_target:
+jobs:
+  set-labels:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Update Labels
+        uses: actions/labeler@v4
+        with:
+          sync-labels: true