Seeing an no output hang at the first step run by a docker agent when there is an environment variable with a value that ends with a double quote.
Like when the github PR being built has a double quote at the end of it's title.
https://github.com/jenkinsci/docker-workflow-plugin/pull/220 did fix the issue for double quotes in other positions.
In my case, where only github PR titles were an issue, the following is a workaround.
That prevented the hang that had occurred when the PR title (env.CHANGE_ENV) was
Note the hang did not occur when PR title (env.CHANGE_ENV) was: