Docker build issues

Hello,

I recognized two issue with the Dockerfile

1. COPY DISCLAIMER /DISCLAIMER -> fails due to file doesnt'exist

2.
ENV VITE_POLARIS_API_URL=http://polaris:8181
ENV VITE_POLARIS_REALM=POLARIS
ENV VITE_POLARIS_PRINCIPAL_SCOPE=PRINCIPAL_ROLE:ALL
ENV VITE_OAUTH_TOKEN_URL=http://polaris:8181/api/catalog/v1/oauth/tokens
ENV VITE_POLARIS_REALM_HEADER_NAME=Polaris-Realm

are injected at build time. As they're static other env variables aren't taken into consideration.
I recognized it, because I deployed it behind a reverse proxy, and VITE_POLARIS_API_URL was always set to http://polaris:8181
I removed them for the docker build which makes the config.js working as designed

I'll raise a PR with the suggested removals