exclude polkadot-parachain.asc and .sha256 from .dockerignore (#3013) (#3017)

* exclude polkadot-parachain .asc and .sha256 from .dockerignore

* refactor docker image creation GHA



* add debug

* try without quotes

* test action

* add quotes

* fix quotes atumated image publishing GHA

* delete old unused part

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Co-authored-by: Chevdor <chevdor@users.noreply.github.com>