fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/css-tree/cjs/syntax/atrule/supports.cjs

@@ -0,0 +1,16 @@
+'use strict';
+
+const supports = {
+    parse: {
+        prelude() {
+            return this.createSingleNodeList(
+                this.Condition('supports')
+            );
+        },
+        block(nested = false) {
+            return this.Block(nested);
+        }
+    }
+};
+
+module.exports = supports;