ci: Run make with parallel build support

Signed-off-by: Manuel Mendez <github@i.m.mmlb.dev>

Author: mmlb

.github/workflows/ci.yaml

@@ -10,6 +10,10 @@ jobs:
   validation:
     runs-on: ubuntu-20.04
     steps:
+      - name: Setup Dynamic Env
+        run: |
+          echo "MAKEFLAGS=-j$(nproc)" | tee $GITHUB_ENV
+
       - name: Checkout code
         uses: actions/checkout@v3