Hi Karim,
I wouldn't say using your own docker image is reinventing the wheel as using a customized SO installation isn't, is it? I found really useful adapt your containers to your needs and simplify the overall maintenance and upgrading process.
As we add the code to the image, we have a pipeline process that once the code is upgraded (including the desired plugins) the docker image is rebuilt. Once deployed, we launch the upgrade process (either manually or automatically) to finish the changes in the database.
I wouldn't say using your own docker image is reinventing the wheel as using a customized SO installation isn't, is it? I found really useful adapt your containers to your needs and simplify the overall maintenance and upgrading process.
As we add the code to the image, we have a pipeline process that once the code is upgraded (including the desired plugins) the docker image is rebuilt. Once deployed, we launch the upgrade process (either manually or automatically) to finish the changes in the database.