update(CI): mitigate frequent failure in CircleCI jobs

[Andreagit97]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

This PR performs 2 main actions on the modern-falco-builder to mitigate some issues with the Falco CI:

• It splits various make commands into different docker RUN instructions, in this way we can catch errors in single steps. With the previous approach 👇 we were not able to catch failures when make package failed: the CI job was successful but the build failed https://app.circleci.com/pipelines/github/falcosecurity/falco/3647/workflows/1fca77ee-28c8-4a4c-8344-ff44f3db447f/jobs/31261

RUN source scl_source enable devtoolset-9; \
    cmake ${CMAKE_OPTIONS} /source; \
    make falco -j${MAKE_JOBS}; \
    make package; \
    make tests -j${MAKE_JOBS}; \
    make all -j${MAKE_JOBS} 

• Recently many CI jobs are failing with context timeout exceeding this is because the modern builder container is not able to copy the whole Falco build directory from the container to the CircleCI job's VM. The size of the build directory is almost 6 GB, this huge size causes this context timeout! With this patch, we export only what is really relevant to our integration tests reducing the build directory dimension from 6 GB to 600 MB!

This is not the final solution obviously this is just a workaround to mitigate there frequent CI failures we are facing

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[FedeDP]

I love this!
I'd target Falco 0.34 since we will surely be biten by this issue during the release IMHO. @LucaGuerra ?
/milestone 0.34.0

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 902a3da8583eec555e74fa3e61d0e71a3f02b8fb

[leogr]

I'm a bit concerned about keeping these in sync with the build process, however, it's acceptable at the moment 👍

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, leogr

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