Add a way to escape {{braces}} so they are not getting replaced in commands

[bhelm]

    run(
        'docker ps --all --format "{{.ID}}\t{{.Names}}"'
    );

I tried to run a command containing {{.ID}} placeholders that are used in the docker compose ps formatting template, but these are picket up by the deployer parse function.

I would suggest to add the posibillity to excape the braces using \, replace the variables and after that replace { to { for the command execution.

That way, i could write it like this:

    run(
        'docker ps --all --format "\{\{.ID\}\}\t\{\{.Names\}\}"'
    );

Thank You.

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