Add `Makefile` target for insurance pool build

[Levi-Ojukwu]

Description:

The Makefile has build targets for individual contracts but not for the insurance pool.

Acceptance Criteria:

• Add build-insurance target
• Document in help

Relevant Files: Makefile

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[nazteeemba]

Please assign me to this issue

[payfoxX]

Hi! I'd like to work on this issue.

I'd be happy to contribute this improvement to the project's build workflow. Keeping build targets consistent across all contracts makes development and deployment more straightforward.

My approach would be to:

• Review the existing Makefile structure and naming conventions.
• Add a build-insurance target that follows the same pattern as the existing contract build targets.
• Update the help target/documentation so the new command is discoverable and consistent with the other available commands.
• Verify the new target builds the insurance pool contract successfully without affecting existing build commands.

I'll keep the implementation minimal, consistent with the project's existing conventions, and ensure it satisfies the acceptance criteria.

Thank you for considering my application.

[devJaja]

Hello Maintener!
I'm an experienced software developer
I can solve this issues, ETA 12 hours

[grantfox-oss]

🦊 GrantFox — @devJaja has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #431)
2. Your PR will be reviewed by the Invoice-Liquidity-Network maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@devJaja's PR #437 was approved and merged by @Levi-Ojukwu.

🏆 @devJaja: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (449 total points). Track your full progress on GrantFox.

👏 Great work, @devJaja! Keep contributing to Invoice-Liquidity-Network.