Issue with set_output?

[ericphanson]

I think maybe it needs an EOF for multiline outputs, according to this post: https://medium.com/@ibraheemabukaff/github-actions-exporting-multi-line-one-line-value-environment-variable-5bb86d01e866. I'm seeing an issue here:

##[debug]Set output content = **New package: ConstantRNGs v0.0.1**
Error: Unable to process file command 'output' successfully.
Error: Invalid format 'ConstantRNGs: A simple deterministic RNG, for cases when you need high efficiency and don't care about randomness'
##[debug]System.Exception: Invalid format 'ConstantRNGs: A simple deterministic RNG, for cases when you need high efficiency and don't care about randomness'
##[debug]   at GitHub.Runner.Worker.EnvFileKeyValuePairs.GetEnumerator()+MoveNext()
##[debug]   at GitHub.Runner.Worker.SetOutputFileCommand.ProcessCommand(IExecutionContext context, String filePath, ContainerInfo container)
##[debug]   at GitHub.Runner.Worker.FileCommandManager.ProcessFiles(IExecutionContext context, ContainerInfo container)
##[debug]Finishing: Collect Zulip info

[SaschaMann]

I wasn't aware you could even set multiline outputs 😅

Changing set_output to match set_env should do the trick. Ideally with a random EOF token as in #26 (if someone happens to know how to fix those tests) or the current version:

GitHubActions.jl/src/GitHubActions.jl

Lines 188 to 196 in b796c4b

	function set_env(k, v)
	val = cmd_value(v)
	ENV[k] = val
	delimiter = "EOF"
	while occursin(delimiter, val)
	delimiter *= "EOF"
	end
	add_to_file("GITHUB_ENV", join(["$k<<$delimiter", val, delimiter], "\n"))
	end