ci 👷: add GitHub Actions workflow for linting and testing

Set up comprehensive CI pipeline with three jobs:

- Lint: Runs ESLint and type checking
- Test: Executes test suite with Coveralls integration
- Build: Verifies package builds correctly

The workflow uses pnpm and caches dependencies for faster runs.

src/index.ts

@@ -5,7 +5,7 @@ import customOrderRule from './css-rules/custom-order/rule-definition.js';
 export const vanillaExtract = {
   meta: {
     name: '@antebudimir/eslint-plugin-vanilla-extract',
-    version: '1.4.4',
+    version: '1.4.5',
   },
   rules: {
     'alphabetical-order': alphabeticalOrderRule,