fix: set Rivet runner version in image

Dockerfile

@@ -12,7 +12,9 @@ COPY src ./src
 RUN npx tsc -p tsconfig.json
 
 FROM base AS runtime
+ARG RIVET_RUNNER_VERSION=dev
 ENV NODE_ENV=production
+ENV RIVET_RUNNER_VERSION=$RIVET_RUNNER_VERSION
 COPY --from=deps /app/node_modules ./node_modules
 COPY --from=build /app/dist ./dist
 COPY package.json ./