Patches do not support inserting into the middle of existing arrays

[jackwilsdon]

What happened?
Patches do not support inserting into the middle (or start) of existing arrays.

What did you expect to happen instead?
Patches can insert values into the middle (or start) of an existing array, per the JSON Patch specification: https://datatracker.ietf.org/doc/html/rfc6902#appendix-A.2

How can we reproduce the bug? (as minimally and precisely as possible)

1. Save this devspace.yaml:

   version: v2beta1
   
   hooks:
     - events:
         - event
       command: echo first
     - events:
         - event
       command: echo second
     - events:
         - event
       command: echo third
   
   profiles:
     - name: insert-first
       patches:
         - op: add
           path: hooks[0]
           value:
             events:
               - event
             command: echo new first
     - name: insert-last
       patches:
         - op: add
           path: hooks
           value:
             events:
               - event
             command: echo new last

2. Run devspace print -p insert-first and get the following error:

   fatal yaml: unmarshal errors:
     line 5: mapping key "command" already defined at line 2
     line 6: mapping key "events" already defined at line 3
   

3. Run devspace print -p insert-last and get the following output (correctly added to end of hooks):

   version: v2beta1
   name: test
   hooks:
       - events:
           - event
         command: echo first
       - events:
           - event
         command: echo second
       - events:
           - event
         command: echo third
       - events:
           - event
         command: echo new last

Local Environment:

• DevSpace Version: 6.3.3
• Operating System: macOS Sonoma 14.0
• ARCH of the OS: arm64

[lizardruss]

Thanks for reporting this! Yes it looks to work for simple values, but not for objects. We'll look into a fix!