chore: Upgrade to Ruby 3.2.1 & Rails 6.0

* chore: upgrade to rails 6.0

* chore: upgrade ruby to 3.2.1

* chore: upgrade bundler

* chore: upgrade execjs

* chore: upgrade to rails 6.1

* chore: switch to sentry-ruby from raven

* chore: add extra platforms to gemfile

app/models/concerns/has_authentication.rb

@@ -0,0 +1,59 @@
+module HasAuthentication
+
+  extend ActiveSupport::Concern
+
+  included do
+    has_secure_password
+
+    validates :password, length: { minimum: 8, allow_blank: true }
+
+    when_attribute :password_digest, changes_to: :anything do
+      before_save do
+        self.password_reset_token = nil
+        self.password_reset_token_valid_until = nil
+      end
+    end
+  end
+
+  class_methods do
+    def authenticate(email_address, password)
+      user = where(email_address: email_address).first
+      raise Postal::Errors::AuthenticationError, "InvalidEmailAddress" if user.nil?
+      raise Postal::Errors::AuthenticationError, "InvalidPassword" unless user.authenticate(password)
+
+      user
+    end
+  end
+
+  def authenticate_with_previous_password_first(unencrypted_password)
+    if password_digest_changed?
+      BCrypt::Password.new(password_digest_was).is_password?(unencrypted_password) && self
+    else
+      authenticate(unencrypted_password)
+    end
+  end
+
+  def begin_password_reset(return_to = nil)
+    self.password_reset_token = Nifty::Utils::RandomString.generate(length: 24)
+    self.password_reset_token_valid_until = 1.day.from_now
+    save!
+    AppMailer.password_reset(self, return_to).deliver
+  end
+
+end
+
+class Postal::Errors::AuthenticationError < Postal::Error
+
+  attr_reader :error
+
+  def initialize(error)
+    @error = error
+  end
+
+  def to_s
+    "Authentication Failed: #{@error}"
+  end
+
+end
+
+# -*- SkipSchemaAnnotations