Remove .env* copy during build

We've removed all of the .env files, so there's nothing to copy anymore.

Author: Sloan Thompson

contracts/solidity/dashboard/Dockerfile

@@ -12,7 +12,6 @@ RUN apk add --update --no-cache \
 
 COPY package.json /app/package.json
 COPY package-lock.json /app/package-lock.json
-COPY .env* /app/
 
 RUN npm install