Add WAL file for database and log instance deployment failures

OTSSignsOrchestrator.Core/Services/ComposeValidationService.cs

@@ -1,4 +1,5 @@
 using Microsoft.Extensions.Logging;
+using OTSSignsOrchestrator.Core.Configuration;
 using YamlDotNet.RepresentationModel;
 
 namespace OTSSignsOrchestrator.Core.Services;
@@ -91,6 +92,11 @@ public class ComposeValidationService
 
         if (HasKey(root, "secrets") && root.Children[new YamlScalarNode("secrets")] is YamlMappingNode secretsNode)
         {
+            var presentSecrets = secretsNode.Children.Keys
+                .OfType<YamlScalarNode>()
+                .Select(k => k.Value!)
+                .ToHashSet(StringComparer.OrdinalIgnoreCase);
+
             foreach (var (key, value) in secretsNode.Children)
             {
                 if (value is YamlMappingNode secretNode)
@@ -99,6 +105,23 @@ public class ComposeValidationService
                         warnings.Add($"Secret '{(key as YamlScalarNode)?.Value}' is not external.");
                 }
             }
+
+            // Validate that all required MySQL secrets are declared
+            if (!string.IsNullOrEmpty(customerAbbrev))
+            {
+                var requiredSecrets = new[]
+                {
+                    AppConstants.CustomerMysqlPasswordSecretName(customerAbbrev),
+                    AppConstants.CustomerMysqlUserSecretName(customerAbbrev),
+                    AppConstants.GlobalMysqlHostSecretName,
+                    AppConstants.GlobalMysqlPortSecretName,
+                };
+                foreach (var required in requiredSecrets)
+                {
+                    if (!presentSecrets.Contains(required))
+                        errors.Add($"Missing required secret: '{required}'.");
+                }
+            }
         }
 
         return new ValidationResult { Errors = errors, Warnings = warnings };