[PR] Docker: update baseos to Ubuntu 22.04 [madlib]

["tuhaihe (via GitHub)" <gi...@apache.org>]

tuhaihe opened a new pull request, #632:
URL: https://github.com/apache/madlib/pull/632

   This PR is used to update the base Docker image for better reusability.
   
   Main changes:
   - Update the base os image to official Ubuntu 22.04, the old one `gcr.io/data-gpdb-public-images/gpdb7-ubuntu20.04-test` is not available anymore.
   - Update the base os from Ubuntu 20.04 to 22.04 since Ubuntu 20.04 has ended life. This change will allow us to install the newer PostgreSQL, or else you will encounter the error as follows:
   
     ``` E: The repository 'http://apt.postgresql.org/pub/repos/apt focal-pgdg Release' does not have a Release file. ```
   
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