Retry job one time in case it is an intermittent issue.

Fixes #2688 (closed)

SLES 12 branch build should get a retry as well: https://gitlab.com/gitlab-org/omnibus-gitlab/blob/89c6b905b38040dce0b694affc125dd257516d29/.gitlab-ci.yml#L685

@marin looked through and only found the one missing entry

assigned to @marin

added 1 commit

• 6d01797b - Add retry to sles branch builds.

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