Update GitHub Actions workflow for Go project

Updated Go version and modified branch filter for push events. Added build step for the application.

Author: mateusmlo

.github/workflows/main.yml

@@ -6,7 +6,7 @@ on:
       - main
   push:
     branches:
-      - main
+      - "**"
 
 jobs:
   test:
@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24.1'
+          go-version: "1.21"
           cache: true
 
       - name: Download dependencies
@@ -32,6 +32,9 @@ jobs:
       - name: Run go vet
         run: go vet ./...
 
+      - name: Build application
+        run: go build -v ./...
+
       - name: Run tests
         run: go test -v -race -coverprofile=coverage.out ./...