add build and test action

.github/workflows/build-and-test.yml

@@ -0,0 +1,21 @@
+name: Build and Test
+run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
+on: [push]
+jobs:
+  build-linux:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.19.x'
+      - name: Install dependencies
+      - name: Build
+        run: go build -v ./aoc/...
+      - name: Test with the Go CLI
+        run: go test 
+