build: add ARG and ENV declarations for Vite build arguments

Dockerfile

@@ -17,6 +17,22 @@ RUN npm ci
 COPY ./ ./
 # Copy vendor from composer-builder because Vite needs to process CSS from packages (e.g. livewire/flux)
 COPY --from=composer-builder /app/vendor ./vendor
+# Define build arguments that Vite can use
+ARG VITE_APP_NAME
+ARG VITE_REVERB_APP_KEY
+ARG VITE_REVERB_HOST
+ARG VITE_REVERB_PORT
+ARG VITE_REVERB_SCHEME
+ARG VITE_REVERB_PATH
+
+# Export them as ENV so the npm run build process can access them
+ENV VITE_APP_NAME=$VITE_APP_NAME
+ENV VITE_REVERB_APP_KEY=$VITE_REVERB_APP_KEY
+ENV VITE_REVERB_HOST=$VITE_REVERB_HOST
+ENV VITE_REVERB_PORT=$VITE_REVERB_PORT
+ENV VITE_REVERB_SCHEME=$VITE_REVERB_SCHEME
+ENV VITE_REVERB_PATH=$VITE_REVERB_PATH
+
 RUN npm run build
 
 # 3. Production Stage