Show short part of stdout/stderr in the mail body

[0xERR0R]

Each mail notification contains currently only the job name, execution status, duration and command. Stdout/stderr are attached as file. I think, it would be great, if mail body would contain a part (let say last 50 lines) of stdout/stderr. For many jobs, it would be enough, the user will see the job result directly in the mail and must not open the attachment.

What do you think about it? I can prepare a PR.

[cardonator]

Personally would love this, also on Slack messages.

[SanderDelden]

I agree, having this would be a nice addition

[bereldhuin]

+1