Security fixes (#4725)

Dockerfile

-FROM ruby:2.7.5-alpine3.14 AS base
+FROM ruby:2.7.7-alpine3.16 AS base
 
 # Set a variable for the install location.
 ARG RAILS_ROOT=/usr/src/app

Gemfile

@@ -59,7 +59,7 @@ end
 
 group :development, :test do
   gem 'byebug', '~> 11.1', platform: :mri
-  gem 'dotenv-rails', '~> 2.7', '>= 2.7.6'
+  gem 'dotenv-rails', '~> 2.8', '>= 2.8.1'
 end
 
 group :test do

Gemfile.lock

@@ -507,7 +507,7 @@ DEPENDENCIES
   byebug (~> 11.1)
   cancancan (~> 2.3.0)
   coveralls (~> 0.8.23)
-  dotenv-rails (~> 2.7, >= 2.7.6)
+  dotenv-rails (~> 2.8, >= 2.8.1)
   factory_bot_rails (~> 6.2, >= 6.2.0)
   faker (~> 2.16)
   font-awesome-sass (~> 5.9.0)