Skip tests gracefully when external dependencies unavailable

[Copilot]

Test suite failed with exit code 1 when SONAR_DB_DSN or CERTMGR_CA_DIR_URL environment variables were unset, blocking local development without database/ACME services.

Changes

Database tests (6 files): Exit with status 0 instead of 1 when SONAR_DB_DSN unset

• internal/actionsdb/actions_test.go
• internal/database/db_test.go
• internal/dnsdb/dnsdb_test.go
• internal/httpdb/httpdb_test.go
• internal/modules/api/api_test.go
• internal/modules/api/apiclient/client_test.go

Certificate manager test: Use t.Skip() instead of t.Fatal() when CERTMGR_CA_DIR_URL unset

• pkg/certmgr/certmgr_test.go

// Before
if dsn = os.Getenv("SONAR_DB_DSN"); dsn == "" {
    fmt.Fprintln(os.Stderr, "empty SONAR_DB_DSN")
    os.Exit(1)
}

// After
if dsn = os.Getenv("SONAR_DB_DSN"); dsn == "" {
    fmt.Fprintln(os.Stderr, "Skipping database tests: SONAR_DB_DSN not set")
    os.Exit(0)
}

Tests now skip gracefully in local environments while running normally in CI where dependencies are provided.

Original prompt

Test

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