fix: properly run script

action.yml

@@ -22,8 +22,9 @@ runs:
   using: docker
   image: docker://gcr.io/kaniko-project/executor:debug
   entrypoint: /bin/sh
-  steps:
-    - run: |
+  args:
+    - -c
+    - |
       mkdir -p /kaniko/.docker
       echo '{"auths":{"${{ inputs.registry }}":{"auth":"'$(printf "%s:%s" "${{ inputs.username }}" "${{ inputs.password }}" | base64 | tr -d '\n')'"}}}' > /kaniko/.docker/config.json
       cat > /tmp/Dockerfile <<EOF