daily job running mobile example on real devices

.github/start-mobile-example/.gitignore

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+node_modules/
+/test-results/
+/playwright-report/
+/playwright/.cache/
+screenshot.png

.github/start-mobile-example/mobile.conf.js

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+exports.config = {
+    user: process.env.BROWSERSTACK_USERNAME,
+    key: process.env.BROWSERSTACK_ACCESS_KEY,
+
+    updateJob: false,
+    specs: [
+        './specs/screenshot.js'
+    ],
+    exclude: [],
+
+    capabilities: [{
+        project: "Bevy Example",
+        build: 'Bevy Example Runner',
+        name: 'run_example',
+        device: process.env.DEVICE || 'Samsung Galaxy S23',
+        os_version: process.env.OS_VERSION || "13.0",
+        app: process.env.BROWSERSTACK_APP_ID,
+        'browserstack.debug': true,
+        orientation: 'LANDSCAPE'
+    }],
+
+    logLevel: 'info',
+    coloredLogs: true,
+    screenshotPath: './screenshots/',
+    baseUrl: '',
+    waitforTimeout: 10000,
+    connectionRetryTimeout: 90000,
+    connectionRetryCount: 3,
+
+    framework: 'mocha',
+    mochaOpts: {
+        ui: 'bdd',
+        timeout: 20000
+    }
+};