Open Tender Procedure For The Collective Catering Service With Reduced Environmental Impact Pursuant To Art. 57, Paragraph 2, Art. 71, Art. 108 And Art. 130 Of The Legislative Decree. 31 March 2023, N.36, With The Application Of The Cam Ministerial Decree. N. 65 Of 10 March 2020 Official Gazette. 90 161 Of 4 April 2020 In The Canteens Of The Penitentiary Institutes And In The Education Institute Of The Lombardy Regional Authority