Enhance Docker deployment with environment variable configuration

- Added environment variable setup in docker-compose.yml for VITE_API_URL.
- Introduced update-docker-env.sh script to create/update .env file for local and remote deployments.
- Updated Dockerfile to dynamically create env-config.js during build.
- Modified frontend to load environment configuration from env-config.js.
- Refactored API client to use centralized config for API URL.

worklenz-frontend/Dockerfile

@@ -7,6 +7,10 @@ COPY package.json package-lock.json ./
 RUN npm ci
 
 COPY . .
+
+# Create env-config.js dynamically during build
+RUN echo "window.VITE_API_URL='${VITE_API_URL:-http://backend:3000}';" > ./public/env-config.js
+
 RUN npm run build
 
 FROM node:22-alpine AS production
@@ -16,13 +20,13 @@ WORKDIR /app
 RUN npm install -g serve
 
 COPY --from=build /app/build /app/build
+COPY --from=build /app/public/env-config.js /app/build/env-config.js
 
-# Create a script to inject environment variables
+# Create a script to start server and dynamically update env-config.js
 RUN echo '#!/bin/sh\n\
-cat > /app/build/env.js << EOL\n\
-window.env = {\n\
-  VITE_API_URL: "${VITE_API_URL}"\n\
-};\n\
+# Update env-config.js with runtime environment variables\n\
+cat > /app/build/env-config.js << EOL\n\
+window.VITE_API_URL="${VITE_API_URL:-http://backend:3000}";\n\
 EOL\n\
 exec serve -s build -l 5000' > /app/start.sh && \
 chmod +x /app/start.sh