fix: Fixed issue with upgrade openresty failed

[zhengkunwang223]

Refs #13469

[Copilot]

Pull request overview

Fixes OpenResty upgrade/rollback failures caused by missing WEBSITE_DIR during env rendering (refs #13469), by ensuring WEBSITE_DIR is always derived and normalized to an absolute path during upgrade env generation.

Changes:

• Update renderUpgradeEnv to accept *model.AppInstall, allowing it to persist env adjustments (notably WEBSITE_DIR) back into install.Env for OpenResty upgrades.
• Preserve selected OpenResty build-related env keys from the original .env and ensure WEBSITE_DIR is set (fallback to settings) and absolute.

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[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

Suppressed comments (1)

agent/app/service/app_upgrade.go:709

• renderUpgradeEnv now parses the existing .env content for all upgrades and returns an error if parsing fails. Previously, .env parsing wasn't required for non-OpenResty upgrades (and OpenResty parsing was effectively best-effort), so a user-edited/legacy .env that Docker Compose can still tolerate could now block upgrades entirely. Consider treating original env parsing as best-effort (fall back to empty map on parse errors), or scoping parsing to the OpenResty-specific branch where it's actually needed.

	if len(original) > 0 {
		var err error
		originalEnv, err = godotenv.UnmarshalBytes(original)
		if err != nil {
			return nil, err