v0.1.3: Add VERSION to website build

Dockerfile.website

@@ -1,3 +1,6 @@
+FROM alpine:latest AS version
+COPY VERSION.txt /tmp/version.txt
+
 FROM node:20-alpine AS builder
 
 WORKDIR /app/www
@@ -8,6 +11,8 @@ COPY www/ ./
 RUN node build-blog.js
 
 FROM nginx:alpine
+COPY --from=version /tmp/version.txt /tmp/version.txt
+ENV VERSION=$(cat /tmp/version.txt)
 
 COPY --from=builder /app/www/ /usr/share/nginx/html/
 COPY docker-entrypoint.d/ /docker-entrypoint.d/