Fix Dockerfile templates: add helpers.php

[LordRobinCbz]

I have tested the new Dockerfiles and builded multiples images to test the mTLS options,here multiples screens.

I have defined 2 PMA hosts: one without cert and mtls, and the other one with correct configuration. This way I have tested cross configuration files for cross databases auth system (so we can use SSL, mTLS and plain text in the same container).

Firstly, the incorrect configuration:

We can see that MaxScale, configured with mTLS is denying the first auth request. No new feature here.

Now with the correct configruation:

No error on MaxScale size, certs are accepted by MariaDB and PMA is connected and we get SSL/MariaDB server informations. The new feature is working.

But during tests, I seen that the helpers.php was missing in templates and in generated Dockerfiles. So it was not imported during build and base64 vars wans't decoded.

I fixed the problem and now, as far I see, everything is working :)

Tests was done locally, in a Docker SWARM plateform and in K8S.

[LordRobinCbz]

Hello @williamdes , sorry for his amout of commit, I dont know if its a normal situation.
The last one is the one we need: 5 files edtied as describe in the PR. :)

[williamdes]

Hello @williamdes , sorry for his amout of commit, I dont know if its a normal situation. The last one is the one we need: 5 files edtied as describe in the PR. :)

Thank you !
Avoid creating PRs and pushing commits from the master or default branch ;)
I did a rebase to clean up the history before merging