Release docs for v2.3

Release CLI: Fix upload path

Bring in changes from release branch (edgelesssys#479)

* Bump version to v2.2.0

* Update changelog

* Fix release detection in pipeline

* Fix PKI selection in pipeline

* Set enforced measurements for AWS

* Update default images

* Fix release docs

* Update mini-con defaults

* Fix measurements action

* Fix syft env variable naming

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

Update cosign action env varis

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

Fix macos e2e test

Fix macos e2e test