Optimize disk space usage for sealer load

[kakaZhou719]

What happen?

Currently, sealer support multi-architecture image.

When load the image tar file, we need four times more empty disk space.

examples:

1. package file：cnstack-edas-2.1.0-rc024-536ad66-879bff.tar

2. the extract the directory for multi-architecture images：
   /var/lib/sealer/tmp/.DTmp-271281710/8ebe9b3d0d5d483fb9c5ae9fd6c2a2b4b9a4c3359950a2669497808719963717.tar （real image file）
   /var/lib/sealer/tmp/.DTmp-271281710/Metadata（manifest name）

3. containers tmp extract dir： /var/tmp/oci2012003652/blobs/sha256/

4. containers image storage ：/var/lib/containers/

so, we need to optimize disk space usage for sealer load

Relevant log output?

No response

What you expected to happen?

No response

How to reproduce it (as minimally and precisely as possible)?

No response

Anything else we need to know?

No response

What is the version of Sealer you using?

No response

What is your OS environment?

No response

What is the Kernel version?

No response

Other environment you want to tell us?

• Cloud provider or hardware configuration:
• Install tools:
• Others:

[starnop]

1. merge the temp root dir for step 2 and step 3
2. provide a param that allows the user to specify the temp root dir for sealer load
3. try to delete the temp dir for step 2 between step 3 and step 4

[kakaZhou719]

1. merge the temp root dir for step 2 and step 3
2. provide a param that allows the user to specify the temp root dir for sealer load
3. try to delete the temp dir for step 2 between step 3 and step 4

4. support load a single image to specified manifest.