fix: ensure migration sets appropriate kind (#230)

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**Motivation:**
<!--
Explain here the context, and why you're making that change. What is the
problem you're trying to solve.
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As an AVS developer that has already created a project, I want to be
certain the migration to v0.0.7 properly defines `deployed_l*_contracts`
sequence so that the migrations complete successfully.

**Modifications:**
<!--
Describe the modifications you've done from a high level. What are the
key technical decisions and why were they made?
-->
- Changes `deployed_l*_contracts` default to `SequenceNode`

**Result:**
<!--
*After your change, what will change.
-->
- Migration completes successfully

**Testing:**
<!--
*List testing procedures taken and useful artifacts.
-->
- Tested locally

Author: grezle

config/contexts/migrations/v0.0.6-v0.0.7.go

@@ -137,15 +137,15 @@ func Migration_0_0_6_to_0_0_7(user, old, new *yaml.Node) (*yaml.Node, error) {
 				Path:      []string{"context", "deployed_l1_contracts"},
 				Condition: migration.Always{},
 				Transform: func(_ *yaml.Node) *yaml.Node {
-					return &yaml.Node{Kind: yaml.MappingNode, Content: []*yaml.Node{}}
+					return &yaml.Node{Kind: yaml.SequenceNode, Content: []*yaml.Node{}}
 				},
 			},
 			// Add deployed_l2_contracts section
 			{
 				Path:      []string{"context", "deployed_l2_contracts"},
 				Condition: migration.Always{},
 				Transform: func(_ *yaml.Node) *yaml.Node {
-					return &yaml.Node{Kind: yaml.MappingNode, Content: []*yaml.Node{}}
+					return &yaml.Node{Kind: yaml.SequenceNode, Content: []*yaml.Node{}}
 				},
 			},
 			// Remove deployed_contracts section

pkg/commands/build.go

@@ -27,6 +27,24 @@ var BuildCommand = &cli.Command{
 	Action: func(cCtx *cli.Context) error {
 		logger := common.LoggerFromContext(cCtx.Context)
 
+		// Migrate config
+		configsMigratedCount, err := configs.MigrateConfig(logger)
+		if err != nil {
+			logger.Error("config migration failed: %w", err)
+		}
+		if configsMigratedCount > 0 {
+			logger.Info("configs migrated: %d", configsMigratedCount)
+		}
+
+		// Migrate contexts
+		contextsMigratedCount, err := contexts.MigrateContexts(logger)
+		if err != nil {
+			logger.Error("context migrations failed: %w", err)
+		}
+		if contextsMigratedCount > 0 {
+			logger.Info("contexts migrated: %d", contextsMigratedCount)
+		}
+
 		// Run scriptPath from cwd
 		const dir = ""
 
@@ -49,24 +67,6 @@ var BuildCommand = &cli.Command{
 			}
 		}
 
-		// Migrate config
-		configsMigratedCount, err := configs.MigrateConfig(logger)
-		if err != nil {
-			logger.Error("config migration failed: %w", err)
-		}
-		if configsMigratedCount > 0 {
-			logger.Info("configs migrated: %d", configsMigratedCount)
-		}
-
-		// Migrate contexts
-		contextsMigratedCount, err := contexts.MigrateContexts(logger)
-		if err != nil {
-			logger.Error("context migrations failed: %w", err)
-		}
-		if contextsMigratedCount > 0 {
-			logger.Info("contexts migrated: %d", contextsMigratedCount)
-		}
-
 		// Handle version increment
 		version := cfg.Context["devnet"].Artifact.Version
 		if version == "" {