feat: move to Dockerfile heredoc

As of Dockerfile format spec 1.4, we can use heredocs instead of escaped line breaks. This is much more readable.

assigned to @wdconinc

added 1 commit

• 720c1922 - fix: rm incorrect escaped newline

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requested review from @sly2j

added 1 commit

• c787a38b - feat: heredoc in xl.Dockerfile

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enabled an automatic merge when the pipeline for c787a38b succeeds

aborted the automatic merge because target branch was updated

added 4 commits

• 196c15b0 - 1 commit from branch master
• cee9f773 - feat: move to Dockerfile heredoc
• ecd63117 - fix: rm incorrect escaped newline
• 8755096e - feat: heredoc in xl.Dockerfile

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merged