add firefox headless mode

Author: kstekovi

package.json

@@ -30,7 +30,6 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@cypress/xvfb": "1.2.4",
     "@types/command-line-args": "5.2.0",
     "@types/mochawesome": "6.2.1",
     "@types/portscanner": "2.1.1",

packages/testsuite/run-e2e-tests.ts

@@ -11,6 +11,7 @@ const optionDefinitions: OptionDefinition[] = [
     type: String,
     defaultValue: "packages/testsuite/cypress/e2e/**/*.cy.ts",
   },
+  { name: "headless", type: Boolean, defaultValue: false },
 ];
 
 (async () => {
@@ -20,6 +21,7 @@ const optionDefinitions: OptionDefinition[] = [
   const projectRoot = path.resolve(__dirname, "..", "..", "..");
   const testRunResult = await cypress.run({
     browser: options.browser as string,
+    headless: options.headless as boolean,
     project: projectRoot,
     configFile: path.join(projectRoot, "cypress.config.ts"),
     env: {