Update Dockerfile

Node version set to a dynamic value `current-slim`, making the github action last a century without trouble, hehe.

Author: dheshalj

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18-slim
+FROM node:current-slim
 RUN npm install -g firebase-tools
 COPY entrypoint.sh /usr/local/bin
 ENTRYPOINT ["entrypoint.sh"]