restart_services.sh: restart pipeline service when .env file changes

[JenySadadia]

Environment variable KCI_API_TOKEN is required to run pipeline services. The variable is defined in .env file. Add a script to monitor .env file using inotifywait tool. If the file changes are detected, that is if the token is modified, restart all the services.

[JenySadadia]

inotifywait perfectly detects changes when tested with nano and visual studio editors.
I have monitored closed_write event for file changes that will detect when a file is closed after being opened in writable mode.

The script did not work with vim though. I investigated and the reason is, vim does not overwrite a file. Instead when a file is modified, it creates a new file, writes content to it, then deletes the old file and moves the new file with the old file name. That's why the tool is not able to detect the file changes as the original gets deleted every time a file is modified with vim.

Hence, the script solely depends on the editor's behavior.

[nuclearcat]

LGTM,thanks, we might evolve this script to ENTRYPOINT later on

[pawiecz]

I might be missing background information on requirements for this script. In case list of tracked events should be extended to also cover e.g. vim, I'd suggest entr which would also cover that (but would also require some rework in the script: ls '.env' | <loop body>).

There's a handy list of file watchers in case this topic would be revisited in future.

[JenySadadia]

@pawiecz Here is the requirements for the script #358