feature: support custom start.sh in topdir or bin subfolder.

Dockerfile

@@ -23,5 +23,5 @@ ENV py_requirements=./requirements.txt
 ENV apt_requirements=./requirements-apt.txt
 ENV app=main:app
 ENV opts=''
-ENV PATH=.:${PATH}
+ENV PATH=./:./bin:${PATH}
 CMD start.sh

README.md

@@ -15,11 +15,12 @@ you can:
 - change requirement file path for apt install by apt_requirements environment variable.
 - change requirement file path for pip install by py_requirements  environment variable.
 - change upgrade strategy      for pip install by pip_install_opt  environment variable.
+- use your own start.sh (boot up script) to full control boot procedure. in below case, ${PWD}/start.sh or ${PWD}/bin/start.sh if exists and it is executable.
 
 ```bash
 docker run --rm -it -p 8000:8000 -v ${PWD}:${PWD} -w ${PWD} -e py_requirements=${PWD}/requirements.txt -e pip_install_opt='--upgrade --upgrade-strategy eager' -e apt_requirements=${PWD}/requirements-apt.txt -e app=main:app -e opts='--host 0.0.0.0 --reload --reload-include "*.py" --reload-include "*.conf"' itaru2622/fastapi:bookworm
 #
-# the above cmd start docker container  with:
+# the above cmd starts docker container via (/usr/local/bin/)start.sh with:
 #
 apt  install -y ${apt_requirements}
 pip3 install -r ${py_requirements} ${pip_install_opt}