ci: add semantic PR label workflow

Author: dstrates

.github/workflows/changelog.yml

@@ -0,0 +1,34 @@
+name: Semantic PR Label
+run-name: Validate PR Label ${{ github.sha }} by @${{ github.actor }}
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened, labeled, unlabeled]
+
+permissions:
+  pull-requests: read
+
+jobs:
+  main:
+    name: Semantic PR Label
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check for Required Labels
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const requiredLabels = ["none", "patch", "minor", "major"];
+            const { data: labels } = await github.rest.issues.listLabelsOnIssue({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+
+            const hasRequiredLabel = labels.some(label => requiredLabels.includes(label.name));
+
+            if (!hasRequiredLabel) {
+              core.setFailed(`PR must have one of the following labels: ${requiredLabels.join(", ")}`);
+            } else {
+              console.log(`PR has a valid label.`);
+            }