[Release Automation] Label PRs with GitHub Action

.github/workflows/label-pr.yml

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+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This workflow utilizes https://github.com/actions/github-script in GitHub Actions to apply labels to pull requests.
+#
+
+name: Label PR
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+
+      - name: Label PR
+        uses: actions/github-script@v4
+        with:
+          async: yes
+          repo-token: ${{ secrets.AGONES_BOT }}
+          script: |
+            const keywords = {
+              "breaking": "kind/breaking",
+              "bug": "kind/bug",
+              "feature": "kind/feature",
+              "cleanup": "kind/cleanup",
+              "documentation": "kind/documentation",
+              "hotfix": "kind/hotfix"
+            };
+
+            const prBody = context.payload.pull_request.body;
+            const prLabels = [];
+
+            const regex = /^\s*\/kind\s+(.+)$/m;
+            const match = prBody.match(regex);
+
+            console.log(`PR body: '${prBody}'`);
+            console.log(`Regex match: '${match}'`);
+
+            if (match && match[1] in keywords) {
+              const keyword = match[1];
+              const label = keywords[keyword];
+              console.log(`Adding label: '${label}' based on keyword '${keyword}'`);
+              prLabels.push(label);
+            } else {
+              console.log(`Adding label: 'kind/other' as no matching keyword found.`);
+              prLabels.push("kind/other");
+            }
+
+            try {
+              await github.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.payload.pull_request.number,
+                labels: prLabels
+              });
+            } catch (error) {
+              console.error(`Error retrieving files: ${error}`);
+            }