Fix Playwright dev container feature to install browsers under non-root user

src/playwright/install.sh

@@ -1,3 +1,12 @@
 #!/bin/bash
 
-npx playwright install --with-deps ${BROWSERS}
+set -e
+
+# Install Playwright browsers
+# If _REMOTE_USER is set and not root, install as that user
+# Otherwise install as root (test scenarios)
+if [ -n "${_REMOTE_USER}" ] && [ "${_REMOTE_USER}" != "root" ] && id -u "${_REMOTE_USER}" > /dev/null 2>&1; then
+    su "${_REMOTE_USER}" -c "npx playwright install --with-deps ${BROWSERS}"
+else
+    npx playwright install --with-deps ${BROWSERS}
+fi

test/playwright/scenarios.json

@@ -14,5 +14,13 @@
         "browsers": "firefox chromium"
       }
     }
+  },
+  "test_user_install": {
+    "image": "ubuntu:focal",
+    "features": {
+      "playwright": {
+        "browsers": "chromium"
+      }
+    }
   }
 }

test/playwright/test_user_install.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+# Test that Playwright is installed
+check "Playwright is available" npx playwright --version
+
+# Check that browsers are installed in user's home directory (not root)
+CURRENT_USER=$(whoami)
+USER_HOME=$(eval echo ~${CURRENT_USER})
+
+# Verify browser cache exists in the user's home directory
+check "Browser cache in user home" test -d "${USER_HOME}/.cache/ms-playwright"
+
+# Verify the cache directory is owned by the current user
+check "Browser cache owned by user" bash -c "[ \"\$(stat -c '%U' ${USER_HOME}/.cache/ms-playwright)\" = \"${CURRENT_USER}\" ]"
+
+# Verify browsers are not installed in root directory (if we're not root)
+if [ "${CURRENT_USER}" != "root" ]; then
+    check "Browser cache not in root" bash -c "! test -d /root/.cache/ms-playwright || [ \"\$(ls -A /root/.cache/ms-playwright 2>/dev/null | wc -l)\" = \"0\" ]"
+fi
+
+# Test that browsers can be listed (validates installation)
+check "Can list browsers" npx playwright install --list
+
+# Verify the user can run playwright commands without permission issues
+check "User can run playwright" bash -c 'npx playwright --help | grep -q "Usage"'
+
+reportResults