Create sha256 checksums file during release (#713)
Create sha256 checksums file during release (#713)


brunoqc/alertmanager,joehandzik/alertmanager,Kellel/alertmanager,prometheus/alertmanager,Aloomaio/alertmanager,GoogleCloudPlatform/alertmanager,joehandzik/alertmanager,joehandzik/alertmanager,prometheus/alertmanager,Aloomaio/alertmanager,tinytub/alertmanager,tyrken/alertmanager,prometheus/alertmanager,Aloomaio/alertmanager,brunoqc/alertmanager,tinytub/alertmanager,brunoqc/alertmanager,Kellel/alertmanager,tyrken/alertmanager,tyrken/alertmanager,brunoqc/alertmanager,tinytub/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,Kellel/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,tyrken/alertmanager