Update ci.yml

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI for seL4
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Environment
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential cmake git
+      
+      - name: Configure Build
+        run: |
+          mkdir build
+          cd build
+          cmake ..
+      
+      - name: Build Project
+        run: |
+          cd build
+          make
+      
+      - name: Run Tests
+        run: |
+          cd build
+          make test