Fixed a bug in the action

Author: chipkent

README.md

@@ -3,6 +3,9 @@
 This is a GitHub Action to delete GitHub packages.  It is very useful to clean up unneeded Docker 
 images in the GitHub Container Registry (ghcr.io) after a PR is closed. 
 
+The example below removes Docker images in ghcr.io with the specified package name and tag.  Here, `github-token`
+is set to a secret, `CI_ACTION_TOKEN`, which is a personal access token with package deletion permissions.
+
 ```
 # Delete Docker images after PR merge
 #
@@ -18,7 +21,7 @@ jobs:
     name: Delete image from ghcr.io
     runs-on: ubuntu-latest
     steps:
-      - uses: chipkent/action-cleanup-package@v1.0.0
+      - uses: chipkent/action-cleanup-package@v1.0.1
         with:
           package-name: ${{ github.event.repository.name }}
           tag: pr-${{ github.event.pull_request.number }}

action.yml

@@ -19,5 +19,7 @@ runs:
         python-version: '3.8'
     - name: Install packages
       run: pip install requests
+      shell: bash
     - name: Delete image from ghcr.io
       run: python ${{ github.action_path }}/docker-cleanup.py ${{ inputs.package-name }} ${{ inputs.tag }} ${{ inputs.github-token }}
+      shell: bash