Tekton Pipeline release v0.4.0

Tekton Pipeline Release v0.3.1 "Chartreux C-3P0" w/ bug fix

remove redundant error check

There is no new err being set since `configMapWatcher.Start`. So there
is no way this condition could be true here.

Tekton Pipeline release v0.2.0

entrypoint: in case of step command failure, write postfile

The entrypoint package wraps the step commands and execute them. This
allows use to use pods containers with some order. In a step, the
entrypoint binary will wait for the file of the previous step to be
present to execute the actual command.

Before this change, if a command failed (`exit 1` or something),
entrypoint would not write a file, and thus the whole pod would be
stuck running (all the next step would wait forever).

This fixes that by always writing the post-file — and making
the *waiter* a bit smarter :

- it will now look for a `{postfile}.err` to detect if the previous
  step failed or not.
- if the previous steps failed, it will fail too without executing the
  step commands.

Signed-off-by: Vincent Demeester <[email protected]>

Knative Build Pipeline release v0.1.0