add pr labeling workflows to packit (#239)

.github/.patch_files

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+.github/.patch_files
+.github/.syncignore
+.github/CODEOWNERS
+.github/dependabot.yml
+.github/labels.yml
+.github/workflows/check-pr-labels.yml
+.github/workflows/codeql-analysis.yml
+.github/workflows/label-pr.yml
+.github/workflows/lint.yml
+.github/workflows/synchronize-labels.yml
+.github/workflows/test-pull-request.yml
+.gitignore
+LICENSE
+NOTICE
+README.md

.github/workflows/check-pr-labels.yml

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+name: Validate PR Labels
+on:
+  pull_request:
+    branches:
+    - main
+    types:
+    - synchronize
+    - opened
+    - reopened
+    - labeled
+    - unlabeled
+
+concurrency: pr_labels
+
+jobs:
+  semver:
+    name: Ensure Minimal Semver Labels
+    runs-on: ubuntu-latest
+    steps:
+    - uses: mheap/github-action-required-labels@v1
+      with:
+        count: 1
+        labels: semver:major, semver:minor, semver:patch
+        mode: exactly

.github/workflows/label-pr.yml

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+name: Auto-label PR
+on:
+  pull_request:
+    branches:
+    - main
+
+concurrency: pr_labels
+
+jobs:
+  semver-label:
+    name: Semver Auto-Label
+    runs-on: ubuntu-latest
+    steps:
+    - name: Auto-label Semver
+      uses: paketo-buildpacks/github-config/actions/pull-request/auto-semver-label@main
+      env:
+        GITHUB_TOKEN: ${{ secrets.PAKETO_BOT_GITHUB_TOKEN }}