Provide explanation for where user email came from (#1869)

* Provide explanation for where user email came from

* bringing back the newline

.github/workflows/update-test-ubuntu-git.yml

@@ -31,7 +31,7 @@ jobs:
       # Use `docker/login-action` to log in to GHCR.io. 
       # Once published, the packages are scoped to the account defined here.
       - name: Log in to the ghcr.io container registry
-        uses: docker/login-action@v3.1.0
+        uses: docker/login-action@v3.3.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -48,7 +48,7 @@ jobs:
 
       # Use `docker/build-push-action` to build (and optionally publish) the image. 
       - name: Build Docker Image (with optional Push)
-        uses: docker/build-push-action@v5.3.0
+        uses: docker/build-push-action@v6.5.0
         with:
           context: .
           file: images/test-ubuntu-git.Dockerfile

README.md

@@ -286,6 +286,7 @@ jobs:
           git commit -m "generated"
           git push
 ```
+*NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
 
 # License