Updated to ruby 3.0.0

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '2.7.2'
+ruby '3.0.0'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '6.0.3.4'
 # Use sqlite3 as the database for Active Record

deploy/rails-dev-Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7.2
+FROM ruby:3.0.0
 
 RUN apt-get -qq update \
   && apt-get -qq install -y \

deploy/rails-prod-Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7.2-slim
+FROM ruby:3.0.0-slim
 
 #HEALTHCHECK --start-period=60s CMD curl http://127.0.0.1/