chalk loads an invalid config without error if it was previously valid and then is trapped forever

[indecisivedragon]

Description

chalk loaded a valid config and then on reloading the same config but with an invalid line, the validation will passed without error, but then any further actions with that chalk binary will fail immediately because of the invalid config (including trying to load another config or get back to default)

Impact

we can't reload updated configs since validation is wonky, or if we do try a reload then chalk is broken forever after

Steps to Reproduce

1. build chalk (from main)

2. load some valid config, ex one of the standard ones:

   liming@system76-pc:~/workspace/chalk$ ./chalk load ./configs/embed_sboms.c4m
   info:  Invalid chalk mark in autocompletion script. Updating.
   info:  Installed bash auto-completion file to: /home/liming/.local/share/bash_completion/completions/chalk.bash
   info:  Attempting to load module from: ./configs/embed_sboms.c4m
   
   Configuring Component: /home/liming/workspace/chalk/configs/embed_sboms                                                                            
   Finished configuration for /home/liming/workspace/chalk/configs/embed_sboms                                                                        
   info:  [testing config]: Validating configuration.
   info:  [testing config]: Configuration successfully validated.
   info:  Configuration replaced in binary: /home/liming/workspace/chalk/chalk
   info:  /home/liming/.local/chalk/chalk.log: Open (sink conf='default_out')
   info:  Full chalk report appended to: ~/.local/chalk/chalk.log

   and observe validation passes

3. add the following invalid line to the above config: log_level = debug

4. reload the same config and see that validation passes again:

   liming@system76-pc:~/workspace/chalk$ ./chalk load ./configs/embed_sboms.c4m
   info:  Invalid chalk mark in autocompletion script. Updating.
   info:  Installed bash auto-completion file to: /home/liming/.local/share/bash_completion/completions/chalk.bash
   info:  Attempting to load module from: ./configs/embed_sboms.c4m
   
   Configuring Component: /home/liming/workspace/chalk/configs/embed_sboms                                                                            
   Finished configuration for /home/liming/workspace/chalk/configs/embed_sboms                                                                        
   info:  [testing config]: Validating configuration.
   info:  [testing config]: Configuration successfully validated.
   info:  Configuration replaced in binary: /home/liming/workspace/chalk/chalk
   info:  /home/liming/.local/chalk/chalk.log: Open (sink conf='default_out')
   info:  Full chalk report appended to: ~/.local/chalk/chalk.log

5. any further chalk actions result in error:

   liming@system76-pc:~/workspace/chalk$ ./chalk insert ls-test
   error: chalk: [embedded config]: 10:13: 
   Variable debug used before definition
   log_level = debug
             ^
   error: Could not load configuration files. exiting.
   liming@system76-pc:~/workspace/chalk$ ./chalk load default
   error: chalk: [embedded config]: 10:13: 
   Variable debug used before definition
   log_level = debug
             ^
   error: Could not load configuration files. exiting.

Other Information

[ee7]

Good catch. This is a regression in chalk versions 0.4.0 and 0.4.1 introduced by https://github.com/crashappsec/chalk/commit/a08d38e6d3f3648d7facf88d8828043d06fec3d5. Worked in 0.3.5.