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.github/workflows/cleanup.yaml

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+name: Cleanup Environment
+on: [delete]
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    if: github.event.ref_type == 'branch'
+
+    steps:
+      - name: Prepare Variables
+        run: |
+          REPO_LOWER=$(echo "${{ gitea.repository }}" | cut -d'/' -f2 | tr '[:upper:]' '[:lower:]')
+          BRANCH_NAME=${{ github.event.ref }}
+          BRANCH_LOWER=$(echo "$BRANCH_NAME" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9-]/-/g')
+          TARGET_NS="${REPO_LOWER}-${BRANCH_LOWER}"
+          echo "TARGET_NS=$TARGET_NS" >> $GITHUB_ENV
+
+      - name: Protect Main
+        if: env.TARGET_NS == 'escape-teacher-main' || env.TARGET_NS == 'escape-teacher-master'
+        run: |
+          echo "❌ Main darf nicht gelöscht werden!"
+          exit 1
+
+      - name: Setup Kubectl
+        run: |
+          curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+          chmod +x kubectl
+          mv kubectl /usr/local/bin/
+          mkdir -p $HOME/.kube
+          echo "${{ secrets.KUBE_CONFIG }}" > $HOME/.kube/config
+          chmod 600 $HOME/.kube/config
+          sed -i 's|server: https://.*:6443|server: https://kubernetes.default.svc:443|g' $HOME/.kube/config
+
+      - name: Delete Namespace
+        run: |
+          echo "🗑️ Lösche Namespace: ${{ env.TARGET_NS }}"
+          kubectl delete namespace ${{ env.TARGET_NS }} --ignore-not-found --wait=false