Add more information on testing for devs

[olethanh]

No description provided.

[github-actions]

Category: BLACK

Explanation: The PR contains extensive changes that have a high potential for introducing bugs or that require deep understanding of the project architecture. This includes a large number of changes to the TESTING.md file, which is a documentation file. The PR includes instructions for debugging tests and runtimes, which are critical for developers who are working on the project. Additionally, the PR modifies the shebang line of a runtime file, which could potentially lead to unexpected behavior.

Highlight:

diff  --git a/TESTING.md b/TESTING.md
index 67f9143b..7adbae0c 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -44,3 +44,30  @@ hatch env create testing
 ```shell
 hatch run testing:test

+## Debugging the tests
+Some tricks and options that might help debugging problematic tests.
+
+Only launch pytest with a test name and more verbose debugging
+shell +hatch run testing:pytest -vv --log-level=DEBUG --full-trace -o log_cli=true -k <TEST NAME> +
+
+
+Specify --capture=no to pytest so it launch. This way you get the full output, including firecracker logs
+
+## Debugging runtimes
+If the error is in the runtime:
+Modify the # to pass the -v option to python, which will print all the debugging info
+#!/usr/bin/python3 -vOO
+
+To have these modification take effect you need to rebuild the runtime file using create_disk_image.sh as root
+
+shell +sudo bash create_disk_image.sh +
+
+Don't forget to have the print system log option set ALEPH_VM_PRINT_SYSTEM_LOGS=1
+
+aleph-debian-12-python is used in test_create_execution

The PR also includes a change to the runtime file, which could potentially lead to unexpected behavior. The PR also includes a large number of changes to the TESTING.md file, which is a documentation file. Therefore, this PR falls into the 'BLACK' category.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.84%. Comparing base (7b89523) to head (c99d67e).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #642      +/-   ##
==========================================
- Coverage   53.87%   53.84%   -0.04%     
==========================================
  Files          58       58              
  Lines        5310     5310              
  Branches      594      594              
==========================================
- Hits         2861     2859       -2     
- Misses       2311     2313       +2     
  Partials      138      138              

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