[Tile-serving] [openstreetmap/mod_tile] [centos7 container image] mod_tile gives "no datasource plugin directories have been successfully registered" (Issue #433)

[Muhammad Edwin]

dear team,
im trying to containerized `mod_tile` and deploy it to a Kubenernetes environment using below Dockerfile

```
https://github.com/openstreetmap/mod_tile/blob/master/docker/centos/7/Dockerfile
```

however had this issue when connecting to an external pgsql instance

```
** (process:9): ERROR **: 10:53:30.385: An error occurred while loading the map layer 'xxxx': Could not create datasource for type: 'postgis' (no datasource plugin directories have been successfully registered)  encountered during parsing of layer 'ocean-lz' in Layer at line 260 of '/style.xml'
```

it seems like it is due to `plugins_dir` which is empty in the centos7 image
```
[mapnik]
plugins_dir=/usr/lib/mapnik/3.1/input
font_dir=/usr/share/fonts/truetype
font_dir_recurse=true
```

question : 
what is need to be done in order to make this container image able to connect to an external postgis instance?

thank you.

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