Fix entrypoint .env generation: use sed for robust quoting

The while/read loop was failing to properly quote env values with spaces
(APP_NAME="El Captain Manager" caused dotenv parse failure). sed handles
all edge cases (spaces, multiple = signs, special chars) in one pass.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/entrypoint.sh

@@ -7,11 +7,9 @@ mkdir -p storage/framework/{cache/data,sessions,views} storage/logs bootstrap/ca
 chown -R www-data:www-data storage bootstrap/cache
 chmod -R 775 storage bootstrap/cache
 
-# Build .env from Docker env vars (quoted to handle spaces)
+# Build .env from Docker env vars (quoted to handle spaces and special chars)
 : > .env
-env | grep -E "^(APP_|DB_|LOG_|SESSION_|CACHE_|QUEUE_|FILESYSTEM_|BROADCAST_|MAIL_|CAPROVER_|PG_ADMIN_|SHARED_PG_|ELCAPTAIN_|TRUSTED_|BCRYPT_)" | sort | while IFS='=' read -r key value; do
-    echo "${key}=\"${value}\"" >> .env
-done
+env | grep -E "^(APP_|DB_|LOG_|SESSION_|CACHE_|QUEUE_|FILESYSTEM_|BROADCAST_|MAIL_|CAPROVER_|PG_ADMIN_|SHARED_PG_|ELCAPTAIN_|TRUSTED_|BCRYPT_)" | sort | sed 's/=\(.*\)/="\1"/' >> .env
 
 # Generate APP_KEY if not already set, then ensure it's in .env
 if ! grep -q "^APP_KEY=\"base64:" .env 2>/dev/null; then