ci(e2e): install Playwright browsers via npx on CI; remove invalid pytest flag; keep repo-local TMPDIR/basetemp

Author: patchmemory

.github/workflows/tests.yml

@@ -21,14 +21,13 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -e .[dev]
-      - name: Install Playwright system dependencies
-        if: matrix.tier == 'e2e'
-        run: |
-          npx playwright install-deps
       - name: Install Playwright browsers
         if: matrix.tier == 'e2e'
+        env:
+          PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/dev/test-runs/pw-browsers
+          TMPDIR: ${{ github.workspace }}/dev/test-runs/tmp
         run: |
-          npx playwright install
+          npx playwright install chromium --with-deps
       - name: Prepare repo-local temp directories
         run: |
           mkdir -p dev/test-runs/{tmp,pytest-tmp,artifacts,downloads,pw-browsers}