Add stub of validate-inputs

.github/tests/validate-inputs/action.yml

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+---
+name: Test action for validate-inputs
+description: |
+  Uses validate-inputs action for checking inputs and throws
+  an error when any of them is invalid.
+inputs:
+  number:
+    description: Should be a number
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - name: Runs validate-inputs
+      uses: ./validate-inputs

.github/workflows/test-validate-inputs.yml

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+---
+name: Test validate-inputs action
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    name: Test validate-inputs action
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Call action with invalid input
+        uses: ./.github/tests/validate-inputs
+        with:
+          number: 'aa'
+
+      - name: Call action with valid input
+        uses: ./.github/tests/validate-inputs
+        with:
+          number: '123'

validate-inputs/action.yml

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+---
+name: Validate inputs
+description: |
+  This action uses regular expressions to validate inputs
+runs:
+  using: 'node20'
+  main: 'dist/index.js'

validate-inputs/dist/index.js

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+/******/ (() => { // webpackBootstrap
+/******/ 	/* webpack/runtime/compat */
+/******/ 	
+/******/ 	if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = __dirname + "/";
+/******/ 	
+/************************************************************************/
+var __webpack_exports__ = {};
+try {
+  console.log(process.env);
+
+} catch (error) {
+  core.setFailed(error.message);
+}
+
+module.exports = __webpack_exports__;
+/******/ })()
+;

validate-inputs/package.json

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+{
+  "name": "validate-inputs",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}

validate-inputs/src/index.js

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+try {
+  console.log(process.env);
+
+} catch (error) {
+  core.setFailed(error.message);
+}