configure Matomo reporting

[matthewberry]

The Matomo container contains a file /bitnami/matomo/config/config.ini.php that we need to modify.

The current version of the file contains this block:

[General]
salt=d7b6a091d960c70afcb3d65d22d2d6a3
trusted_hosts[]=127.0.0.1
trusted_hosts[]=matomo.mmli2.ncsa.illinois.edu
enable_trusted_host_check=0

We need to replace that block with this block:

[General]
salt=d7b6a091d960c70afcb3d65d22d2d6a3
trusted_hosts[]=127.0.0.1
trusted_hosts[]=matomo.mmli2.ncsa.illinois.edu
enable_trusted_host_check=0
enable_processing_unique_visitors_day = 1
enable_processing_unique_visitors_week = 1
enable_processing_unique_visitors_month = 1
enable_processing_unique_visitors_year = 1
enable_processing_unique_visitors_range = 1

Note the block should appear at the same position in the file, namely, after the [database] block and before the [PluginsInstalled] block.

[bodom0015]

Added a SealedSecret containing the full config.ini.php contents, and a VolumeMount for mounting this in at runtime 👍
https://git.ncsa.illinois.edu/kubernetes/clusters/mmli2/-/blob/main/charts/matomo/values.prod.yaml?ref_type=heads#L35-49

I'm not sure if this invalidates any previously-defined configuration that might have been used to generate this file (for example, I suspect that existingSecret is/was used to populate the [database] section of this file previously, but as long as we don't need many future additions to this configuration, I'm hoping this is stable 🙏 😅

Feel free to close this once we confirm that this setting is working!