add GH action for basic build test

Author: luizirber

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  merge_group:
+
+jobs:
+  default:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-13]
+    runs-on: ${{ matrix.os }}
+    name: Build on ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: prefix-dev/setup-pixi@v0.8.0
+        with:
+          pixi-version: v0.38.0
+          cache: true
+          cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
+
+      - run: pixi run ci
+
+      - run: |
+	  ./build/fulgor | grep "Fulgor: a colored de Bruijn graph index"
+	shell: pixi run bash -e {0}
+        name: check