Fix Dockerfile templates: add helpers.php #453
                
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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.