buildx failed with: ERROR: failed to solve: failed to push Zilliqa/scilla:devops-700: invalid reference format: repository name must be lowercase

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The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/