Update bundler, fix Docker build check (#108)

Author: crespire

Dockerfile

@@ -2,7 +2,7 @@
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
 ARG RUBY_VERSION=3.3.5
-FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
+FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here
 WORKDIR /rails
@@ -15,7 +15,7 @@ ENV RAILS_ENV="production" \
 
 
 # Throw-away build stage to reduce size of final image
-FROM base as build
+FROM base AS build
 
 # Install packages needed to build gems and node modules
 RUN apt-get update -qq && \

Gemfile.lock

@@ -279,4 +279,4 @@ RUBY VERSION
    ruby 3.3.5p100
 
 BUNDLED WITH
-   2.4.21
+   2.6.9