Fix retriggering the release CI

[chmouel]

When CI has failed and we retrigger CI we get a failure :

++ git --no-pager tag --points-at HEAD
+ version='0.6.x
stable'
+ [[ -z 0.6.x
stable ]]
+ stable_tag=0.6.x
+ msg='Release 0.6.x
stable, Stable Tag: 0.6.x'
+ echo Release 0.6.x stable, Stable Tag: 0.6.x
Release 0.6.x stable, Stable Tag: 0.6.x
+ export 'PAC_VERSION=0.6.x
stable' 'TARGET_BRANCH=0.6.x
stable'
+ PAC_VERSION='0.6.x
stable'
+ TARGET_BRANCH='0.6.x
stable'
++ ./hack/generate-releaseyaml.sh
+ hack/upload-file-to-github.py --message 'Release yaml generated for Release 0.6.x
stable, Stable Tag: 0.6.x' --owner-repository openshift-pipelines/pipelines-as-code --token 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 --update-tags=stable,0.6.x --from-tag=refs/tags/0.6.x stable -f /dev/fd/63:release.k8s.yaml -f /dev/fd/62:release.yaml
++ env TARGET_OPENSHIFT=true ./hack/generate-releaseyaml.sh
sed: -e expression #1, char 155: unterminated `s' command
sed: -e expression #1, char 155: unterminated `s' command
usage: upload-file-to-github.py [-h] --filename FILENAME --message MESSAGE
                                --owner-repository OWNER_REPOSITORY
                                [--update-tags UPDATE_TAGS] --token TOKEN
                                [--branch-ref BRANCH_REF]
                                [--from-tag FROM_TAG]
upload-file-to-github.py: error: unrecognized arguments: stable

since we have two tags and it woul fail on it,