github: specify workflow permissions

[marquiz]

Update gh-pages has started failing with default permissions. It needs write permissions to be able to push to the gh-pages branch.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marquiz

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[marquiz]

/assign @ArangoGutierrez
/cc @tobiasgiese

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[tobiasgiese]

seems reasonable to me
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7ef477a689ceae5cabc7124afdc0d3cd3458e136

[tobiasgiese]

/cherry-pick release-0.16

[k8s-infra-cherrypick-robot]

@tobiasgiese: new pull request created: #1907

In response to this:

/cherry-pick release-0.16

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[marquiz]

/cherry-pick release-0.15

[k8s-infra-cherrypick-robot]

@marquiz: new pull request created: #1926

In response to this:

/cherry-pick release-0.15

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.