mealie: start.sh missing after failed update (#13958)

* fix(mealie): restore start.sh before build steps to prevent broken container

When CLEAN_INSTALL=1 wipes /opt/mealie/* and a subsequent build step fails
(uv sync, yarn install, yarn generate - e.g. due to OOM or network error),
start.sh was never written because it was created at the very end of the
update function. On the next reboot systemd could not find the ExecStart
binary and the container was left in a permanently broken state.

Fix: move mealie.env restore and start.sh creation to immediately after
fetch_and_deploy_gh_release, before any build steps that can fail. This
ensures the service entry point is always present even if the build is
interrupted, allowing uv to self-heal on next startup.

Fixes: #13945

* fix(mealie): backup and restore start.sh alongside mealie.env

Instead of recreating start.sh from a heredoc after CLEAN_INSTALL wipes
/opt/mealie/*, simply back it up before the wipe and restore it together
with mealie.env. Simpler and avoids any drift between the hardcoded
heredoc and what was actually installed.

* fix(mealie): fallback heredoc if start.sh missing before backup

ct/mealie.sh

@@ -38,10 +38,27 @@ function update_script() {
 
     msg_info "Backing up Configuration"
     cp -f /opt/mealie/mealie.env /opt/mealie.env
+    [[ -f /opt/mealie/start.sh ]] && cp -f /opt/mealie/start.sh /opt/mealie.start.sh
     msg_ok "Backup completed"
 
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "mealie" "mealie-recipes/mealie" "tarball"
 
+    msg_info "Restoring Configuration"
+    mv -f /opt/mealie.env /opt/mealie/mealie.env
+    if [[ -f /opt/mealie.start.sh ]]; then
+      mv -f /opt/mealie.start.sh /opt/mealie/start.sh
+    else
+      cat <<'STARTEOF' >/opt/mealie/start.sh
+#!/bin/bash
+set -a
+source /opt/mealie/mealie.env
+set +a
+exec uv run mealie
+STARTEOF
+    fi
+    chmod +x /opt/mealie/start.sh
+    msg_ok "Configuration restored"
+
     msg_info "Installing Python Dependencies with uv"
     cd /opt/mealie
     $STD uv sync --frozen --extra pgsql
@@ -70,18 +87,6 @@ function update_script() {
     $STD uv run python -m nltk.downloader -d /nltk_data averaged_perceptron_tagger_eng
     msg_ok "Updated NLTK Data"
 
-    msg_info "Restoring Configuration"
-    mv -f /opt/mealie.env /opt/mealie/mealie.env
-    cat <<'STARTEOF' >/opt/mealie/start.sh
-#!/bin/bash
-set -a
-source /opt/mealie/mealie.env
-set +a
-exec uv run mealie
-STARTEOF
-    chmod +x /opt/mealie/start.sh
-    msg_ok "Configuration restored"
-
     msg_info "Starting Service"
     systemctl start mealie
     msg_ok "Started Service"