ci: go build and test

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

@@ -0,0 +1,69 @@
+# This workflow will ensure the project is tidy, buildable and all tests pass
+# on every push to the main branch and on every pull request.
+#
+name: Build and Test
+
+on:
+  push:
+    paths:
+      - "**.go"
+      - "go.sum"
+    branches: [main, master]
+  pull_request:
+    paths:
+      - "**.go"
+      - "go.sum"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  GO_VERSION: 1.21
+
+jobs:
+
+  # Check if the go.mod file is tidy
+  tidy:
+      runs-on: ubuntu-latest
+      name: tidy
+      steps:
+      - uses: actions/checkout@v4
+      - name: Setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+      - run: |
+          go mod tidy
+          CHANGES_IN_REPO=$(git status --porcelain)
+          if [[ -n "$CHANGES_IN_REPO" ]]; then
+              echo "Repository is dirty. Showing 'git status' and 'git --no-pager diff':"
+              git status && git --no-pager diff
+              exit 1
+          fi
+
+  # Build and compile the go project
+  build:
+    runs-on: ubuntu-latest
+    name: build
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+      - run: go build ./...
+
+  # Run all standard, go tests
+  test:
+    runs-on: ubuntu-latest
+    name: test
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Test
+        run: go test ./...

main.go

@@ -5,5 +5,5 @@ import (
 )
 
 func main() {
-	fmt.Println("Hello, World!")
+	fmt.Println("Hello, Cosmos!")
 }