chore: release operator-chart 0.1.6

:package: Staging a new release

mp-spdz/operator-chart: empty commit to trigger publication of artifacts (#30) (f9beb81)
mp-spdz/operator-chart: trigger workflows (#37) (1a754c3)
mp-spdz/operator-chart: trigger workflows (#41) (bf8b9b0)
mp-spdz: trigger workflow (5ab6139)
operator-chart: remove legacy chart folder incl. migration of changelog updates (cf5b0f6)
operator-chart: rename chart to make publication workflow work (#47) (b529207)
operator: enable processing of historical / missed etcd-backed roster updates (#49) (cf5b0f6), closes #15
operator: get rid of unsupported trace logging level (cf5b0f6)
operator: use numeric user and group ID in operator dockerfile (cf5b0f6)
operator: use retries to address race condition on etcd roster updates (cf5b0f6)

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