[playwright] Start theia with THEIA_CONFIG_DIR (#10925)

This change modifies the scripts so that theia as a system under test is
started with a dedicated temporary THEIA_CONFIG_DIR for running the
playwright tests.

Fixes #10800

Change-Id: I27b3ee6d908101f7c619a42d7c552a4bf07ca9ac

examples/playwright/.gitignore

@@ -1,2 +1,3 @@
 allure-results
 test-results
+.tmp.cfg

examples/playwright/package.json

@@ -15,7 +15,7 @@
     "prepare": "yarn clean && yarn build",
     "clean": "rimraf lib",
     "build": "tsc --incremental && yarn lint && npx playwright install chromium",
-    "theia:start": "yarn --cwd ../browser start",
+    "theia:start": "rimraf .tmp.cfg && THEIA_CONFIG_DIR=$PWD/.tmp.cfg yarn --cwd ../browser start",
     "lint": "eslint -c ./.eslintrc.js --ext .ts ./src ./tests",
     "lint:fix": "eslint -c ./.eslintrc.js --ext .ts ./src ./tests --fix",
     "ui-tests": "yarn && playwright test --config=./configs/playwright.config.ts",

package.json

@@ -75,7 +75,7 @@
     "rebuild:clean": "rimraf .browser_modules",
     "test": "yarn -s test:theia && yarn -s electron test && yarn -s browser test",
     "test:theia": "lerna run --scope \"@theia/!(example-)*\" test --stream --concurrency=1",
-    "test:playwright": "concurrently --success first -c gray,blue -k -n theia,playwright \"yarn browser start\" \"yarn -s --cwd examples/playwright ui-tests-ci\"",
+    "test:playwright": "concurrently --success first -c gray,blue -k -n theia,playwright \"yarn -s --cwd examples/playwright theia:start\" \"yarn -s --cwd examples/playwright ui-tests-ci\"",
     "watch": "concurrently --kill-others -n tsc,browser,electron -c red,yellow,blue \"tsc -b -w --preserveWatchOutput\" \"yarn -s --cwd examples/browser watch:bundle\" \"yarn -s --cwd examples/electron watch:bundle\"",
     "watch:compile": "concurrently --kill-others -n cleanup,tsc -c magenta,red \"ts-clean dev-packages/* packages/* -w\" \"tsc -b -w --preserveWatchOutput\"",
     "performance:startup": "yarn -s performance:startup:browser && yarn -s performance:startup:electron",