chore: update project to use ES modules and add Rollup configuration

- Changed import statements to use .js extensions for module compatibility
- Added Rollup configuration for building the project
- Updated package.json scripts to use Rollup instead of ncc
- Bumped dependencies related to Rollup and added new plugins
- Modified tsconfig.json for ES module support and adjusted compiler options

Author: chrisreddington

.github/linters/eslint.config.mjs

@@ -28,7 +28,8 @@ export default [
       'coverage/**',
       'test/**',
       '**/.github/linters/**',
-      'vitest.config.mts'
+      'vitest.config.mts',
+      'rollup.config.ts'
     ]
   },
   ...compat.extends(

__tests__/index.test.ts

@@ -2,7 +2,7 @@
  * Unit tests for the action's entrypoint (src/index.ts)
  */
 
-import * as main from '../src/main'
+import * as main from '../src/main.js'
 import { vi, describe, it, expect } from 'vitest'
 
 /**

__tests__/main.test.ts

@@ -1,6 +1,6 @@
 import * as core from '@actions/core'
 import * as fs from 'fs'
-import { run } from '../src/main'
+import { run } from '../src/main.js'
 import {
   vi,
   describe,

__tests__/test-utils.ts

@@ -1,4 +1,4 @@
-import { DevcontainerContent } from '../src/types'
+import { DevcontainerContent } from '../src/types.js'
 
 /**
  * Creates a mock devcontainer configuration for testing purposes.

__tests__/utils.test.ts

@@ -1,5 +1,5 @@
 import { describe, test, expect } from 'vitest'
-import { isDevcontainerContent, stripJsonComments } from '../src/utils'
+import { isDevcontainerContent, stripJsonComments } from '../src/utils.js'
 
 /**
  * Test suite for utility functions used in devcontainer validation.

__tests__/validators.test.ts

@@ -3,8 +3,8 @@ import {
   validateExtensions,
   validateTasks,
   validateFeatures
-} from '../src/validators'
-import { DevcontainerContent } from '../src/types'
+} from '../src/validators.js'
+import { DevcontainerContent } from '../src/types.js'
 
 /**
  * Test suite for devcontainer.json validation functions.