Shell: Set set pipefail by default

[schnatterer]

Using the sh step is prone to error when using pipes.
It's good practice to set set -o pipefail in all bash scripts because otherwise:

cat missingFile | sed s/foo/bar/g

would return a non zero exit code, which is unexepcted and hard to debug.

So: Why doesn't ces-build-lib make life easier for us an prepend pipefail before every sh call?
E.g. like so: script.sh(returnStdout: true, script: "set -e && ${args}")
Note: set -o pipefail fails (haha) with
...script.sh: 1: set: Illegal option -o pipefail.