(refactor) Move hosts file copy from volume mount to Dockerfile

Bake the custom hosts file into the Docker image instead of mounting it as a volume. This simplifies deployment configuration and makes the image more self-contained.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

web-app/Dockerfile

@@ -12,6 +12,9 @@ RUN apk add --no-cache libc6-compat
 
 WORKDIR /app
 
+# copy custom hosts file to avoid issues with some auth providers
+COPY ./etc/hosts /etc/hosts
+
 # Copy package files
 COPY ./package.json ./package-lock.json ./