ci: Add test case for issue 30880

With helm 3.18.0, we had a change in typeIs/typeOf gotemplate behavior where, for example: `typeOf .servicePort` has changed from `float64` to `json.Number`.

Signed-off-by: Marc Millien <marc.millien@lifen.fr>

pkg/engine/funcs_test.go

@@ -127,6 +127,14 @@ keyInElement1 = "valueInElement1"`,
 		tpl:    `{{ lookup "v1" "Namespace" "" "unlikelynamespace99999999" }}`,
 		expect: `map[]`,
 		vars:   `["one", "two"]`,
+	}, {
+		tpl:    `{{ typeOf . }}`,
+		expect: `string`,
+		vars:   `"WEB"`,
+	}, {
+		tpl:    `{{ typeOf . }}`,
+		expect: `int`,
+		vars:   `80`
 	}}
 
 	for _, tt := range tests {