fixup

Author: hebasto

.github/workflows/ci.yml

@@ -81,6 +81,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Set environment variables
+        run: |
+          read -r -a vars <<< "${{ matrix.env_vars }}"
+          for var in "${vars[@]}"; do
+            echo "$var" >> "$GITHUB_ENV"
+          done
+          echo "MAKEFLAGS=-j$(($(nproc) + 1))" >> "$GITHUB_ENV"
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2