Document OIDC support for SinkBinding & ContainerSource

[creydr]

Currently we don't document the OIDC support of the SinkBinding and ContainerSource in https://knative.dev/docs/eventing/features/sender-identity/ (sender-identity.md).

We should document that, as soon as the SinkBindings/ContainerSource sink has an audience and OIDC is enabled, a file will be mounted to the SinkBinding/Container under /oidc/token containing the OIDC token with the audience for the sink

[chaliuu]

/assign @chaliuu

[github-actions[bot]]

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[dprotaso]

@chaliuu you still working on this?

[github-actions[bot]]

This issue is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen the issue with /reopen. Mark the issue as fresh by adding the comment /remove-lifecycle stale.

[creydr]

/remove-lifecycle stale

[creydr]

/unassign chaliuu

[creydr]

/good-first-issue

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