ci: add GitHub Actions workflows for linting, testing, and coverage reporting

Introduced `.github/workflows/audit.yaml` to automate linting (via golangci-lint), testing, coverage generation, and uploading results to Codecov. Enhanced README with a Codecov badge for coverage metrics visibility.

Author: iagapie

.github/workflows/audit.yaml

@@ -0,0 +1,48 @@
+name: Audit
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache-dependency-path: go.sum
+
+      - name: Run Golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          version: v2.7.1
+          args: -v --timeout=5m --build-tags=race
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache-dependency-path: go.sum
+
+      - name: Run tests
+        run: go test -race -v -coverprofile=coverage.txt --covermode=atomic ./...
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+          verbose: true

README.md

@@ -2,6 +2,7 @@
 
 [![Go Reference](https://pkg.go.dev/badge/github.com/gowool/got.svg)](https://pkg.go.dev/github.com/gowool/got)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gowool/got)](https://goreportcard.com/report/github.com/gowool/got)
+[![codecov](https://codecov.io/github/gowool/got/graph/badge.svg?token=U23BO6XII4)](https://codecov.io/github/gowool/got)
 [![License](https://img.shields.io/badge/License-MIT-green.svg)](https://github.com/gowool/got/blob/main/LICENSE)
 
 A Go template theme management library that provides a flexible system for organizing and rendering HTML templates with support for template inheritance, themes, and parent-child relationships.