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[influxdb] Add docs for usage of self-signed certs (#14228)

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* [influxdb] Add docs for usage of self-signed certs

See
https://community.openhab.org/t/influxdb-persistence-doesnt-work-with-s
sl/35409/10?u=florian-h05.

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>
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bundles/org.openhab.persistence.influxdb/README.md
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@ -106,3 +106,13 @@ Besides the metadata tags, there are additional configuration parameters to acti
| addCategoryTag | false | no | Should the category of the item be included as tag "category"? If no category is set, "n/a" is used. |
| addTypeTag | false | no | Should the item type be included as tag "type"? |
| addLabelTag | false | no | Should the item label be included as tag "label"? If no label is set, "n/a" is used. |
### Connect to InfluxDB via TLS
InfluxDB supports TLS encryption to secure the communication with clients.
If you use a self-signed certificate for your InfluxDB instance (which is very likely), you need to add the certificate itself or your internal CA's certificate to the Java keystore:
1. Find your JVM's path with `ls -all /usr/bin/java`, e.g. `/opt/java/zulu17.38.21-ca-jdk17.0.5-linux_aarch32hf/bin/java`. You may need to follow some symlinks, use `ls -all` again.
1. Go to the `lib/security` directory of your JVM, e.g. `cd /opt/java/zulu17.38.21-ca-jdk17.0.5-linux_aarch32hf/lib/security`.
1. Add the certificate to the JVM's keystore: `sudo keytool -importcert -file <path-to-certfile> -cacerts -keypass changeit -storepass changeit -alias <alias-for-cert>`.