try parallel plawright (#1579)

* parallel plawright

* test robustness tweak

* change to only double speed

e2e/playwright/flow-tests.spec.ts

@@ -66,10 +66,8 @@ test('Basic sketch', async ({ page }) => {
 
   // click on "Start Sketch" button
   await u.clearCommandLogs()
-  await u.doAndWaitForImageDiff(
-    () => page.getByRole('button', { name: 'Start Sketch' }).click(),
-    200
-  )
+  await page.getByRole('button', { name: 'Start Sketch' }).click()
+  await page.waitForTimeout(100)
 
   // select a plane
   await page.mouse.click(700, 200)
@@ -91,7 +89,6 @@ test('Basic sketch', async ({ page }) => {
   await page.mouse.click(startXPx + PUR * 20, 500 - PUR * 10)
   await page.waitForTimeout(100)
 
-  const num = 26.63
   await expect(page.locator('.cm-content'))
     .toHaveText(`const part001 = startSketchOn('-XZ')
   |> startProfileAt(${commonPoints.startAt}, %)

playwright.config.ts

@@ -18,7 +18,7 @@ export default defineConfig({
   /* Retry on CI only */
   retries: process.env.CI ? 3 : 0,
   /* Opt out of parallel tests on CI. */
-  workers: process.env.CI ? 1 : 1,
+  workers: process.env.CI ? 2 : 1,
   /* Reporter to use. See https://playwright.dev/docs/test-reporters */
   reporter: 'html',
   /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */