Set up config for 'tree-sitter highlight' and update highlight rules for strings

package.json

@@ -13,5 +13,19 @@
   },
   "devDependencies": {
     "tree-sitter-cli": "^0.20.1"
+  },
+  "tree-sitter": [
+    {
+      "file-types": [
+        "Dockerfile",
+        "dockerfile",
+        "docker",
+        "Containerfile",
+        "container"
+      ],
+      "highlights": [
+        "queries/highlights.scm"
+      ]
     }
+  ]
 }

queries/highlights.scm

@@ -35,7 +35,11 @@
 	(image_digest
 		"@" @punctuation.special))
 
-(double_quoted_string) @string
+[
+  (double_quoted_string)
+  (single_quoted_string)
+  (json_string)
+] @string
 
 (expansion
   [