🐛 Fix __create_service_env to write .local.sh to disk 🐛

The .local.sh block defined stub functions in memory but never
wrote the file to disk, so __file_exists_with_content always
failed and __create_service_env returned non-zero on every run.
Fix: use a heredoc to write the stub functions into .local.sh.
- rootfs/usr/local/etc/docker/init.d/zz-nginx.sh: write .local.sh
via heredoc in __create_service_env; bump version to 202606261600-git

rootfs/usr/local/etc/docker/init.d/zz-nginx.sh

rootfs/usr/local/etc/docker/init.d/zz-nginx.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # shellcheck shell=bash
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-##@Version           :  202308281720-git
+##@Version           :  202606261600-git
 # @@Author           :  Jason Hempstead
 # @@Contact          :  jason@casjaysdev.pro
 # @@License          :  WTFPL