rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

app/lib/spreadsheet_file.rb

@@ -0,0 +1,22 @@
+require 'roo'
+
+class SpreadsheetFile
+  def self.parse(file, options = {})
+    filepath = file.is_a?(String) ? file : file.to_path
+    filename = options.delete(:filename) || filepath
+    fileext = File.extname(filename)
+    options[:csv_options] = { col_sep: ';', encoding: 'utf-8' }.merge(options[:csv_options] || {})
+    s = Roo::Spreadsheet.open(filepath, options.merge({ extension: fileext }))
+
+    row_index = 1
+    s.each do |row|
+      if row_index == 1
+        # @todo try to detect headers; for now using the index is ok
+      else
+        yield row, row_index
+      end
+      row_index += 1
+    end
+    row_index
+  end
+end