chore: update tag validation

This commit updates the tag validation for Posts and Questions to set the maximum number of allowed tags to 3,
reflecting the change from min(3) to max(3). This aligns with the requirement that tags should be an array with up to three items.

src/posts/postsValidator.js

@@ -5,15 +5,15 @@ const createPostValidator = Joi.object({
     'string.empty': 'Title is required',
     'any.required': 'Title is required',
   }),
-  tags: Joi.array().items(Joi.string()).min(1).optional().messages({
+  tags: Joi.array().items(Joi.string()).max(3).optional().messages({
     'array.min': 'Tags must be an array with at least one item',
     'array.base': 'Tags must be an array with at least one item',
   }),
 });
 
 const updatePostValidator = Joi.object({
   content: Joi.string().optional(),
-  tags: Joi.array().items(Joi.string()).min(1).optional().messages({
+  tags: Joi.array().items(Joi.string()).max(3).optional().messages({
     'array.min': 'Tags must be an array with at least one item',
     'array.base': 'Tags must be an array with at least one item',
   }),

src/questions/questionsValidator.js

@@ -9,7 +9,7 @@ const createQuestionValidator = Joi.object({
     'string.empty': 'Body is required',
     'any.required': 'Body is required',
   }),
-  tags: Joi.array().items(Joi.string()).min(1).optional().messages({
+  tags: Joi.array().items(Joi.string()).max(3).optional().messages({
     'array.min': 'Tags must be an array with at least one item',
     'array.base': 'Tags must be an array with at least one item',
   }),
@@ -18,7 +18,7 @@ const createQuestionValidator = Joi.object({
 const updateQuestionValidator = Joi.object({
   title: Joi.string().optional().max(100),
   body: Joi.string().optional(),
-  tags: Joi.array().items(Joi.string()).min(1).optional().messages({
+  tags: Joi.array().items(Joi.string()).max(3).optional().messages({
     'array.min': 'Tags must be an array with at least one item',
     'array.base': 'Tags must be an array with at least one item',
   }),