Add editorconfig for yaml, rego and makefile, fix rego tabs

.editorconfig

@@ -0,0 +1,16 @@
+root = true
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.rego]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab

policies/registry.rego

@@ -6,37 +6,37 @@ package before_resolution
 
 # Helper to create attribute registry violations.
 attr_registry_violation(violation_id, group_id, attr_id) = violation {
-	violation := {
-		"id": violation_id,
-		"type": "semantic_convention_policies",
-		"category": "attribute_registry_checks",
-		"group": group_id,
-		"attr": attr_id,
-	}
+    violation := {
+        "id": violation_id,
+        "type": "semantic_convention_policies",
+        "category": "attribute_registry_checks",
+        "group": group_id,
+        "attr": attr_id,
+    }
 }
 
 # We only allow attribute groups in the attribute registry.
 deny[attr_registry_violation("attribute_registry_can_only_contain_attribute_groups", group.id, "")] {
-	group := input.groups[_]
-	startswith(group.id, "registry.")
-	group.type != "attribute_group"
+    group := input.groups[_]
+    startswith(group.id, "registry.")
+    group.type != "attribute_group"
 }
 
 # Any group that is NOT in the attribute registry that has an attribute id is
 # in violation of not using the attribute registry.
 deny[attr_registry_violation("attributes_must_be_defined_in_attribute_registry", group.id, attr.id)] {
-	group := input.groups[_]
-	not startswith(group.id, "registry.")
-	attr := group.attributes[_]
-	attr.id != null
+    group := input.groups[_]
+    not startswith(group.id, "registry.")
+    attr := group.attributes[_]
+    attr.id != null
 }
 
 # A registry `attribute_group` containing at least one `ref` attribute is
 # considered invalid if it's not in the registry group.
 deny[attr_registry_violation("attributes_in_registry_cannot_reference_each_other", group.id, attr.ref)] {
-	# TODO - this will need to be updated to support `embed` in the future.
-	group := input.groups[_]
-	startswith(group.id, "registry.")
-	attr := group.attributes[_]
-	attr.ref != null
+    # TODO - this will need to be updated to support `embed` in the future.
+    group := input.groups[_]
+    startswith(group.id, "registry.")
+    attr := group.attributes[_]
+    attr.ref != null
 }