chore: pin node 24 base image to sha256 digest (#125)

Set the base image to node:24-alpine@sha256:5fa278c599dbba0c8f873d8717d50ecbb57c5ae6a53b7ab240c25135e0b65995 (was node:24-alpine) and pin it to an immutable sha256 digest for reproducible builds.

Author: LautaroPetaccio

Dockerfile

@@ -1,6 +1,6 @@
 ARG RUN
 
-FROM node:24-alpine as builderenv
+FROM node:24-alpine@sha256:5fa278c599dbba0c8f873d8717d50ecbb57c5ae6a53b7ab240c25135e0b65995 as builderenv
 
 WORKDIR /app
 
@@ -18,7 +18,7 @@ RUN yarn install --prod --frozen-lockfile
 
 ########################## END OF BUILD STAGE ##########################
 
-FROM node:24-alpine
+FROM node:24-alpine@sha256:5fa278c599dbba0c8f873d8717d50ecbb57c5ae6a53b7ab240c25135e0b65995
 
 RUN apk update && apk add --update wget && apk add --update tini