data inside /var/www/html is getting override.

Hi There,

I am creating my own docker image from image `WordPress` 
```

FROM WordPress
COPY . /var/www/html
```
When I run the custom image on Kubernetes, whatever I copied data in the docker image gets overridden.
If logs it shows 
```
WordPress not found in /var/www/html - copying now...
Complete! WordPress has been successfully copied to /var/www/html
```
