Update Dockerfile for main branch building

[tuhaihe]

In this PR, these changes are made:

• Update the timezone to Los Angeles
• Remove the passwd as set NOPASSWD for gpadmin and root in the file
  /etc/sudoers
• Add PAX dependencies protobuf-devel and --enable-pax option
• Update the git clone command to fetch the submodules
• Enable lz4 and gpcloud support

closes: #39

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[tuhaihe]

I will test again. Once it's ready, will let you know.

[tuhaihe]

I tested it on a new cloud machine and can run it successfully in the following ways:

./run.sh -c main

./run.sh -c main -m

Now, it's ready for review. Thanks!