fix: suppress unnecessary output during test execution

__fixtures__/core.ts

@@ -0,0 +1,15 @@
+import type * as core from '@actions/core'
+import { vi } from 'vitest'
+
+export const debug = vi.fn<typeof core.debug>()
+export const error = vi.fn<typeof core.error>()
+export const info = vi.fn<typeof core.info>()
+export const getInput = vi
+  .fn<typeof core.getInput>()
+  .mockImplementation((name, options) => {
+    const key = `INPUT_${name.replace(/ /g, '_').toUpperCase()}`
+    return process.env[key] || ''
+  })
+export const setOutput = vi.fn<typeof core.setOutput>()
+export const setFailed = vi.fn<typeof core.setFailed>()
+export const warning = vi.fn<typeof core.warning>()