OONI Probe CLI v3.19.0-alpha.1

This release is an alpha release. It is not ready for general availability and should only be used for QA.

A stable release will follow suit hopefully in a few days from today.

This release is based on v3.19.0-alpha, whose changelog you are encouraged to read.

On top of the v3.19.0-alpha release, this follow-up release adds the following changes backported from the master branch:

• ✨ feat: mvp of conditionally enabling experiments 85b63eb
• 🐛 fix(torsf): bump the version number e5f950b
• ✨ feat: add echcheck to the experimental suite a8f4fc2
• 🐛 fix(ooniprobe): make sure we actually run echcheck d13a7ca
• 🐛 fix(registry): mark torsf as disabled by default 7bcf415
• 🚧 chore: use go1.20.10 a4037a2

In short, we're now based on go1.20.10 (released yesterday). Also, the echcheck experiment now runs as part of ooniprobe run experimental. However, and notably, both echcheck and torsf are now disabled-by-default experiments. This means that they will only run if in the last 24h the backend has told us it was safe to do so. (You can always bypass this restriction by setting the OONI_FORCE_ENABLE_EXPERIMENT environment variable to 1.)

We're setting echcheck as disabled by default because it is a new experiment and we want to use the backend API to incrementally and gradually expose this experiment to all users. We're setting torsf as disabled by default because Snowflake made changes during the ooniprobe 3.18 cycle that broke the torsf experiment, and we want to be robust to potential future similar changes. Hence, while as part of this release we will configure the OONI backend API to allow all users to run torsf, we reserve the possibility of disabling torsf, should it be needed, anytime in the future.