feat: solve secrets on config and backends setup data

[leoparente]

This pull request includes several changes to the agent package, focusing on refactoring, adding new functionality for environment variable resolution, and updating tests. The most important changes include modifying the startBackends method to accept additional parameters, adding new functions to resolve environment variables, and updating the configuration manager to use these new functions.

Refactoring and Enhancements:

• agent/agent.go: Modified the startBackends method to accept cfgBackends and labels as parameters instead of using a.config.OrbAgent.Backends and a.config.OrbAgent.Labels directly. Also, updated the Start method to solve configuration secrets before starting backends. [1] [2] [3]

Environment Variable Resolution:

• agent/config/env.go: Added new functions ResolveEnv, ResolveEnvInMap, and ResolveEnvInSlice to handle environment variable resolution within strings, maps, and slices.
• agent/config/config_test.go: Added comprehensive tests for the new environment variable resolution functions.

Configuration Manager Updates:

• agent/configmgr/git.go: Updated the Git configuration manager to use the new config.ResolveEnv function for resolving environment variables. Removed the old resolveEnv function. [1] [2] [3]
• agent/configmgr/manager.go: Modified the New function to accept an active string parameter instead of a config.ManagerConfig object.

Test Updates:

• agent/agent_prof_test.go: Removed the Test_orbAgent_startBackends test as it was outdated and not providing value.
• agent/configmgr/git_test.go, agent/configmgr/local_test.go, agent/configmgr/manager_test.go: Updated tests to reflect changes in the configuration manager initialization and environment variable resolution. [1] [2] [3] [4] [5] [6] [7] [8]

Policy Manager Updates:

• agent/policymgr/manager.go: Updated the policy manager to use SolvePolicySecrets instead of SolveSecrets and the callback registration method to RegisterUpdatePoliciesCallback. [1] [2] [3]
• agent/policymgr/manager_test.go: Updated mock methods to reflect changes in the policy manager.

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	77.7%	2	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/mocks	0.0%	0	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	77.5%	2	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/otel	76.4%	2	0	0
🟢 PASS	3.02s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	67.8%	2	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/worker	76.9%	2	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/config	100.0%	6	0	0
🟢 PASS	1.05s	github.com/netboxlabs/orb-agent/agent/configmgr	49.4%	9	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/policies	100.0%	15	0	0
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent/policymgr	70.3%	10	0	0
🟢 PASS	2.49s	github.com/netboxlabs/orb-agent/agent/secretsmgr	45.7%	45	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 60.3%

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on GitHub release

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