I have the following application in heroku
https://heroku-magento-mozg.herokuapp.com/
Which has the following origin
https://github.com/mozgbrasil/heroku-magento
Using the following tool
https://heroku-magento-mozg.herokuapp.com/backdoor.php
I executed the commands to download and extract the following tool
https://github.com/kalcaddle/KodExplorer#install
Then using the following tool
http://heroku-magento-mozg.herokuapp.com/KodExplorer-master/index.php?editor
I edited the following file
https://heroku-magento-mozg.herokuapp.com/phpinfo.php
And I added script to display the value "214058"
After some time I tried to change to "21550"
But this change was not displayed
Today 15/02 in the access to phpinfo.php does not display any of the values but the original file
I have seen that this occurs according to the documentation
https://devcenter.heroku.com/articles/dynos#ephemeral-filesystem
My application uses Composer that downloads Magento and its dependencies
It turns out that in the installation step when reporting the database data is being returned error, then I would try to edit the Magento file as per the instructions
https://magento.stackexchange.com/questions/84782/database-connection-error-magento-installation
As my application repository does not have the Magento files since Composer is used how would I make this possible editing?
If you've changed the value using heroku cli, this won't work, because of the ephemeral filesystem. You'll need to commit the change and push the change up, and deploy the new changes.
Each dyno gets its own ephemeral filesystem, with a fresh copy of the most recently deployed code. During the dyno’s lifetime its running processes can use the filesystem as a temporary scratchpad, but no files that are written are visible to processes in any other dyno and any files written will be discarded the moment the dyno is stopped or restarted
Assuming you're using git to manage your code, just redeploy them. Heroku will pick these changes up and deploy a new version of your app.