refactor: move pre-rollout tasks to before templating/rollouts #377
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This moves the pre-rollout tasks to run before the rollout takes place.
If a pre-rollout task needs to perform some action like putting a site into a mode to prevent traffic while the rollout takes place, running the pre-rollout tasks before the images are built and pushed can mean the site is in an unavailable state longer than needed. Running them after the images are built and pushed results in a shorter period.
The images being pushed does not mean that they are live yet, as this happens during the
Apply Deploymentsphase of a build, and pre-rollout tasks will now run betweenImage PushandTemplating Deployments. If pre-rollout tasks fail, there is no impact to the running environment as no deployment changes will have taken place.closes #375