Add elasticache tf file

infrastructure/elasticache.tf

@@ -0,0 +1,39 @@
+resource "aws_security_group" "elasticache_security_group" {
+  name_prefix = "elasticache-"
+  description = "ElastiCache security group"
+
+  ingress {
+    from_port   = 6379
+    to_port     = 6379
+    protocol    = "tcp"
+    cidr_blocks = ["10.0.2.0/24"] // Restrict to a specific CIDR block, ideally your VPC's CIDR
+  }
+}
+
+resource "aws_elasticache_subnet_group" "crossfeed_vpc" {
+  name       = "aws_vpc.crossfeed_vpc"
+  subnet_ids = [aws_subnet.backend.id]
+
+  tags = {
+    Name = "crossfeed_vpc"
+  }
+}
+
+resource "aws_elasticache_cluster" "crossfeed_vpc_elasticache_cluster" {
+  count                = var.create_elastcache_cluster ? 1 : 0
+  cluster_id           = "crossfeed-vpc-cluster"
+  engine               = "redis"
+  node_type            = "cache.r7g.xlarge"
+  num_cache_nodes      = 1
+  parameter_group_name = "default.redis7.1"
+  engine_version       = "7.1.0"
+  port                 = 6379
+  subnet_group_name    = aws_elasticache_subnet_group.crossfeed_vpc.name
+  security_group_ids   = [aws_security_group.elasticache_security_group.id]
+
+  tags = {
+    Name    = "crossfeed_vpc_elasticache-cluster"
+    Project = var.project
+    Stage   = var.stage
+  }
+}