Increase timeout value when pushing to ghcr.io (pytorch#161444)

Seeing this timing out a lots in trunk now https://github.com/pytorch/pytorch/actions/runs/17165552358/job/48705069047.  The benchmark image is the largest one we have on CI, so it's probably over the 30 minutes limit.
Pull Request resolved: pytorch#161444
Approved by: https://github.com/atalman

Author: huydhn

.ci/docker/README.md

@@ -120,8 +120,8 @@ If your new Docker image needs a library installed from a specific pinned commit
    If you're introducing a new argument to the Docker build, make sure to add it in the Docker build step in `.ci/docker/build.sh`:
    ```bash
    docker build \
-      ....
-      --build-arg "NEW_ARG_1=${NEW_ARG_1}"
+     ....
+     --build-arg "NEW_ARG_1=${NEW_ARG_1}"
    ```
 
 3. **Update Dockerfile logic**:

.github/workflows/docker-builds.yml

@@ -124,7 +124,7 @@ jobs:
           GHCR_PAT: ${{ secrets.GHCR_PAT }}
         with:
           shell: bash
-          timeout_minutes: 30
+          timeout_minutes: 60
           max_attempts: 5
           retry_wait_seconds: 90
           command: |