docs(core, enterprise): add token auth + Docker examples

Author: MeelahMe

content/shared/influxdb3-get-started/setup.md

@@ -457,6 +457,7 @@ In your command, replace {{% code-placeholder-key %}}`YOUR_AUTH_TOKEN`{{% /code-
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 [Environment variable (recommended)](#)
 [Command option](#)
+[Docker](#)
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@@ -479,6 +480,31 @@ influxdb3 show databases --token YOUR_AUTH_TOKEN
 ```
 {{% /code-placeholders %}}
 
+{{% /tab-content %}}
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+
+Run the CLI in a Docker container using the `INFLUXDB3_AUTH_TOKEN` environment variable:
+
+{{% code-placeholders "YOUR_AUTH_TOKEN" %}}
+```bash
+docker run --rm \
+  -e INFLUXDB3_AUTH_TOKEN=YOUR_AUTH_TOKEN \
+  quay.io/influxdb/influxdb3:latest \
+  query \
+  --host http://host.docker.internal:8181 \
+  --database example_db \
+  "SHOW TABLES"
+```
+{{% /code-placeholders %}}
+
+> [!Note]
+> Ensure that the database `example_db` exists in the running container.
+> To create it, run:
+>
+> ```bash
+> docker exec -it influxdb3-core influxdb3 create database example_db --token YOUR_AUTH_TOKEN
+> ```
+
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