added terraform version policy

Author: JiJo333

governance/third-generation/cloud-agnostic/restrict-terraform-versions.sentinel

@@ -0,0 +1,18 @@
+#The policy uses the tfplan import to enforce the usage of Terraform version 0.12 or higher
+
+import "tfplan/v2" as tfplan
+
+#Minimum allowed version variable
+min_allowed_version = "0.12.0"
+violations = 0
+
+#Condition to check version
+if (tfplan.terraform_version < min_allowed_version) {
+	violations = 1
+	print("You are using terraform version", tfplan.terraform_version, "which is outdated.Please use any version higher than or equal to", min_allowed_version)
+}
+
+#Main rule
+main = rule {
+	violations is 0
+}

governance/third-generation/cloud-agnostic/test/restrict-terraform-versions/fail.json

@@ -0,0 +1,8 @@
+{
+    "mock": {
+    "tfplan/v2": "mock-tfplan-fail.sentinel"
+  },
+  "test": {
+    "main": false
+  }
+}