docs: add V7 ESM migration and NODE_AUTH_TOKEN behavior change (#1593)

Co-authored-by: gowridurgad <gowridurgad@gmail.com>

README.md

@@ -12,9 +12,13 @@ This action provides the following functionality for GitHub Actions users:
 - Registering problem matchers for error output
 - Configuring authentication for GPR or npm
 
-## Breaking changes in V7
+## What's new in V7
 
-- **Migrated to ESM** to enable support for the latest `@actions/*` package versions.
+- Migrated action internals to ESM for compatibility with latest `@actions/*` packages. No changes to action inputs, outputs, or behavior.
+
+### Breaking change
+
+- The dummy `NODE_AUTH_TOKEN` fallback has been removed, as it could unintentionally affect the generated `.npmrc` with a non-functional token. With this change, if `registry-url` is set without `NODE_AUTH_TOKEN`, legacy Yarn Classic (1.x) and older Node/npm versions may fail, and pnpm may warn. npm Trusted Publishing (OIDC) is not affected, since it does not use `NODE_AUTH_TOKEN`.
 
 ## Breaking changes in V6
 
@@ -30,7 +34,7 @@ This action provides the following functionality for GitHub Actions users:
 - Upgraded action from node20 to node24.
   > Make sure your runner is on version v2.327.1 or later to ensure compatibility with this release. [See Release Notes](https://github.com/actions/runner/releases/tag/v2.327.1)
 
-For more details, see the full release notes on the [releases page](https://github.com/actions/setup-node/releases/v5.0.0)
+For more details, see the full release notes on the [releases page](https://github.com/actions/setup-node/releases)
 
 ## Usage
 

package-lock.json

@@ -34,7 +34,7 @@
         "globals": "^17.7.0",
         "jest": "^30.4.2",
         "jest-each": "^30.4.1",
-        "prettier": "^3.9.5",
+        "prettier": "^3.8.4",
         "ts-jest": "^29.4.11",
         "typescript": "^6.0.3"
       },
@@ -5606,9 +5606,9 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.9.5",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.5.tgz",
-      "integrity": "sha512-/FVl766LpUfB5vXgCYOYa0MeV/441Ia99AeICQIQFTY/Nw0roZwULcXpku5i1/m5kt/baz+s4Zogspd839HSMg==",
+      "version": "3.8.4",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.4.tgz",
+      "integrity": "sha512-N2MylSdi48+5N/6S5j+maeHbUSIzzZ5uOcX5Hm4QpV8Dkb1HFjfAKTKX6yNPJQD9AhcT3ifHNB66tWTTJDi11Q==",
       "dev": true,
       "license": "MIT",
       "bin": {

package.json

@@ -54,7 +54,7 @@
     "globals": "^17.7.0",
     "jest": "^30.4.2",
     "jest-each": "^30.4.1",
-    "prettier": "^3.9.5",
+    "prettier": "^3.8.4",
     "ts-jest": "^29.4.11",
     "typescript": "^6.0.3"
   }