Add GitHub Actions workflow for building and testing Go application

Author: miguelmartens

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+
+      - name: Build
+        run: go build -o bin/cowardly ./cmd/cowardly
+
+      - name: Test
+        run: go test ./...