Add persistCoreSettings function to manage core environment variables

[pablomendezroyo]

Context

This pull request introduces the persistCoreSettings function to ensure critical core environment variables and volume paths are preserved during updates. It enhances the management of core settings by propagating necessary values from the currently installed dappmanager compose.

Approach

The solution reads environment variables from the installed dappmanager compose and applies them to the new core compose services, ensuring that essential settings like DISABLE_HOST_SCRIPTS and volume mappings are correctly maintained.

Test instructions

1. Update the core package and verify that the DISABLE_HOST_SCRIPTS environment variable is correctly set in the core compose.
2. Check that the volume path for /usr/src/dappnode/ matches the DAPPNODE_CORE_DIR from the installed dappmanager compose.
3. Test with different configurations to ensure that the settings persist as expected across updates.

[github-actions]

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