Add s3 tests - fix json parsing in show

Author: vshepard

tests/requirements.txt

@@ -6,7 +6,7 @@
 # 3. From a local directory
 #    /path/to/local/directory/testgres
 testgres==1.10.0
-testgres-pg-probackup2==0.0.2
+git+https://github.com/postgrespro/testgres.git@fix-json-parse-in-show#egg=testgres_pg_probackup2&subdirectory=testgres/plugins/pg_probackup2
 allure-pytest
 deprecation
 minio==7.2.5