Cardano Updates

## Description
add cardano-signer as an alternative to sign itn signature proof, not
using jcli anymore

## Which issue it fixes?
get rid of jcli

add cardano-signer as an alternative to sign itn signature proof, not using jcli anymore

#### Fix: Add ```SUDO=N``` environment variable to built container
Related to issue:
https://github.com/cardano-community/guild-operators/issues/1856

Issue:
Without ```SUDO=N``` defined in the final built container, scripts
running
from inside the container incorrectly attempt to use ```sudo```
commands.

Changes:
- In the dockerfile, ```SUDO=N``` added to ```ENV``` section for global
availability
- Remove redundant ```export SUDO=N``` from ```RUN``` commands (DRY
principle)

Testing:
- Verified container builds without errors
- Confirmed ```SUDO=N``` environment variable is present in final image
- Scripts running within the container now avoid ```sudo``` usage
without the operator having to manually define the ```SUDO``` var

_______________

#### Fix: Resolve undefined variable warning in Docker build
Fix Docker warning during Docker build:
```UndefinedVar: Usage of undefined variable '$CNODE_HOME' (Line 14)```

Issue:
- ```CARDANO_NODE_SOCKET_PATH``` was referencing ```$CNODE_HOME``` before it was defined
- ```ENV``` block processes all variables atomically, so ```$CNODE_HOME``` was undefined
- Container showed incorrect path. Echoing the ```CARDANO_NODE_SOCKET_PATH``` var returns: ```/sockets/node.socket```
   (Should be: ```/opt/cardano/cnode/sockets/node.socket```)

Changes:
- Replace ```$CNODE_HOME``` with literal path in ```CARDANO_NODE_SOCKET_PATH```
- Change from: ```CARDANO_NODE_SOCKET_PATH=$CNODE_HOME/sockets/node.socket```
- Change to: ```CARDANO_NODE_SOCKET_PATH=/opt/cardano/cnode/sockets/node.socket```

Testing:
- Verified container builds without warnings
- Confirmed ```CARDANO_NODE_SOCKET_PATH``` resolves to correct path from within the container

___________

#### Feature: Add ```ll``` alias for ```ls -alhF``` in container
```ll``` command conveniently provides detailed file/directory listings
(similar to how it's aliased in many distros). Since operators may exec
into these containers, this adds a small quality of life improvement,
improving usability when exploring container filesystem.

ls flags enabled:
- -a: Show all files (including hidden)
- -l: Long listing format
- -h: Human-readable file sizes
- -F: File type indicators

Thankyou!

---------

Co-authored-by: illuminatus <[email protected]>