Hello there sandrospadaro! 👋

Thank you and congratulations 🎉 for opening your very first issue in this project! 💖

In case you want to claim this issue, please comment down below! We will try to get back to you as soon as we can. 👀 Hey, thanks for the suggestion. I've considered this but got lost in other stuff :)
[Feature]Use an unprivileged user in the dockerfile
### Is your proposal related to a problem?

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  Provide a clear and concise description of what the problem is.
  For example, "I'm always frustrated when..."
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Use an unprivileged user in the dockerfile

### Describe the solution you'd like

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  Provide a clear and concise description of what you want to happen.
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Change the [Dockerfile](https://github.com/provectus/kafka-ui/blob/master/kafka-ui-api/Dockerfile) as follows:

```Dockerfile
FROM alpine:3.15.0
RUN apk add --no-cache openjdk13-jre libc6-compat gcompat

RUN addgroup -S kafkaui && adduser -S kafkaui -G kafkaui
USER kafkaui

ARG JAR_FILE
COPY "/target/${JAR_FILE}" "/kafka-ui-api.jar"

ENV JAVA_OPTS=

EXPOSE 8080

CMD java $JAVA_OPTS -jar kafka-ui-api.jar
```

### Describe alternatives you've considered

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### Additional context

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kafka-ui-api/Dockerfile
kafka-ui-api/Dockerfile
diff --git a/kafka-ui-api/Dockerfile b/kafka-ui-api/Dockerfile
index ba8569b100d..5488a771810 100644
--- a/kafka-ui-api/Dockerfile
+++ b/kafka-ui-api/Dockerfile
@@ -1,5 +1,9 @@
 FROM alpine:3.15.0
-RUN apk add --no-cache openjdk13-jre libc6-compat gcompat
+
+RUN apk add --no-cache openjdk13-jre libc6-compat gcompat \
+&& addgroup -S kafkaui && adduser -S kafkaui -G kafkaui
+
+USER kafkaui
 
 ARG JAR_FILE
 COPY "/target/${JAR_FILE}" "/kafka-ui-api.jar"
