docs: update github app token vending to non-archived action (#691)

README.md

@@ -86,15 +86,11 @@ jobs:
 
 Instead of using a Personal Access Token (PAT) that is tied to a particular user you can use a [GitHub App](https://docs.github.com/en/developers/apps/building-github-apps) where permissions can be even better tuned. [Create a new app](https://docs.github.com/en/developers/apps/creating-a-github-app) and configure the app permissions and your `config.js` as described in the [Renovate documentation](https://docs.renovatebot.com/modules/platform/github/#running-as-a-github-app).
 
-Store the app ID as a secret with name `APP_ID` and generate a new private key for the app and add it as a secret to the repository as `APP_PEM` in the repository where the action will run from. Note that `APP_PEM` needs to be base64 encoded. You can encode your private key file like this from the terminal on Linux (omit the `-w 0` if you're on a Mac):
-
-```bash
-cat your_app_key.pem | base64 -w 0
-```
+Generate and download a new private key for the app, adding the contents of the downloaded `.pem` file to _Secrets_ (repository settings) with the name `private_key` and app ID as a secret with name `app_id`.
 
 Adjust your Renovate configuration file to specify the username of your bot.
 
-Going forward we will be using the [machine-learning-apps/actions-app-token](https://github.com/machine-learning-apps/actions-app-token) action in order to exchange the GitHub App certificate for an access token that renovate can use.
+Going forward we will be using the [tibdex/github-app-token](https://github.com/tibdex/github-app-token) action in order to exchange the GitHub App certificate for an access token that renovate can use.
 
 The final workflow will look like this:
 
@@ -111,10 +107,10 @@ jobs:
     steps:
       - name: Get token
         id: get_token
-        uses: machine-learning-apps/actions-app-token@master
+        uses: tibdex/github-app-token@v1
         with:
-          APP_PEM: ${{ secrets.APP_PEM }}
-          APP_ID: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.private_key }}
+          app_id: ${{ secrets.app_id }}
 
       - name: Checkout
         uses: actions/checkout@v3.3.0
@@ -123,7 +119,7 @@ jobs:
         uses: renovatebot/github-action@v34.82.0
         with:
           configurationFile: example/renovate-config.js
-          token: 'x-access-token:${{ steps.get_token.outputs.app_token }}'
+          token: '${{ steps.get_token.outputs.token }}'
 ```
 
 ## Environment Variables