fix: add signature validator module to rockspec build configuration

Registers the new validators.signature module in the rockspec build modules list and aligns formatting of validator module entries for consistency.

Author: chrisingenhaag

kong-plugin-jwt-keycloak-1.6.0-1.rockspec

@@ -38,8 +38,9 @@ build = {
     ["kong.plugins."..plugin_name..".keycloak_keys"]      = "src/keycloak_keys.lua",
     ["kong.plugins."..plugin_name..".key_conversion"]     = "src/key_conversion.lua",
     ["kong.plugins."..plugin_name..".gateway.securitylog"] = "src/gateway/securitylog.lua",
-    ["kong.plugins."..plugin_name..".validators.issuers"] = "src/validators/issuers.lua",
-    ["kong.plugins."..plugin_name..".validators.roles"]   = "src/validators/roles.lua",
-    ["kong.plugins."..plugin_name..".validators.scope"]   = "src/validators/scope.lua",
+    ["kong.plugins."..plugin_name..".validators.issuers"]   = "src/validators/issuers.lua",
+    ["kong.plugins."..plugin_name..".validators.roles"]     = "src/validators/roles.lua",
+    ["kong.plugins."..plugin_name..".validators.scope"]     = "src/validators/scope.lua",
+    ["kong.plugins."..plugin_name..".validators.signature"] = "src/validators/signature.lua",
   }
 }