fix(push): use basename for artifacts when compressed in tar.gz

[alacuku]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

/kind flaky-test

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area library

/area cli

/area tests

/area examples

What this PR does / why we need it:

A registry push command like:

falcoctl registry push
   --type plugin --version 0.1.1 
   --requires plugin_api_version:3.1.0 
   --platform linux/amd64
   ghcr.io/alacuku/plugins/plugin/k8smeta:0.1.1 
   /home/aldo/Downloads/libk8smeta.so 

works fine, but when we try to install that artifact we get the following:

falcoctl artifact install ghcr.io/alacuku/plugins/plugin/k8smeta:0.1.1
2024-07-24 15:57:15 INFO  Resolving dependencies ... 
2024-07-24 15:57:16 INFO  Installing artifacts refs: [ghcr.io/alacuku/plugins/plugin/k8smeta:0.1.1]
2024-07-24 15:57:16 INFO  Preparing to pull artifact ref: ghcr.io/alacuku/plugins/plugin/k8smeta:0.1.1
2024-07-24 15:57:17 INFO  Pulling layer bb550464b415 
2024-07-24 15:57:17 INFO  Pulling layer 17c172171107                                                                                                                                                                                                                                                                                                                                                                              
2024-07-24 15:57:20 INFO  Pulling layer 6864efe49a85                                                                                                                                                                                                                                                                                                                                                                              
2024-07-24 15:57:20 INFO  Extracting and installing artifact type: plugin file: libk8smeta.tar.gz                                                                                                                                                                                                                                                                                                                                 
2024-07-24 15:57:20 ERROR cannot extract "/tmp/falcoctl4200489493/libk8smeta.tar.gz" to "/usr/share/falco/plugins": open                                                                                                                                                                                                                                                                                                          
                      │   /usr/share/falco/plugins/home/aldo/Downloads/libk8smeta.so: no such file or directory

The reason is that the tar header in the archive is the file path, in this case home/aldo/Downloads/libk8smeta.so. This PR ensures we use only the base name as a header in the tar archive, hence striping the components from the file path.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[FedeDP]

LGTM!
/approve

[poiana]

LGTM label has been added.

Git tree hash: c1596e7fb07baabcd9ebd3074cf7649244e5f18d

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alacuku, FedeDP

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