Share pipelines.yml across repos

We have dozens of repos, all using bitbucket pipelines. We have standardized stuff as much as possible, i.e. created scripts in our own docker image.

Now when something is changed, like the recent addition of a pipeline for hotfix branches, we need to touch each branch in each repository to update the bitbucket-pipelines.yml.

It would be great if we could centralize this somehow, e.g. configure a global default configuration, or alternatively use a setting in the yml like include: https://some.where/default/bitbucket-pipelines.yml.

For reference, I have attached our bitbucket-pipelines.yml. You'll notice it does not include any repo-specific stuff, and we intend to keep it like this.