purge_old_deployments: Fix running from any path.
purge_old_deployments: Fix running from any path.

eeshangarg/zulip,shubhamdhama/zulip,jackrzhang/zulip,rishig/zulip,zulip/zulip,hackerkid/zulip,synicalsyntax/zulip,hackerkid/zulip,showell/zulip,kou/zulip,shubhamdhama/zulip,punchagan/zulip,mahim97/zulip,verma-varsha/zulip,brockwhittaker/zulip,brainwane/zulip,timabbott/zulip,amanharitsh123/zulip,brainwane/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,brockwhittaker/zulip,hackerkid/zulip,synicalsyntax/zulip,kou/zulip,Galexrt/zulip,punchagan/zulip,punchagan/zulip,synicalsyntax/zulip,synicalsyntax/zulip,brainwane/zulip,dhcrzf/zulip,brockwhittaker/zulip,amanharitsh123/zulip,eeshangarg/zulip,mahim97/zulip,zulip/zulip,timabbott/zulip,verma-varsha/zulip,tommyip/zulip,brockwhittaker/zulip,kou/zulip,andersk/zulip,rishig/zulip,showell/zulip,rht/zulip,Galexrt/zulip,kou/zulip,rishig/zulip,zulip/zulip,jackrzhang/zulip,andersk/zulip,rishig/zulip,shubhamdhama/zulip,timabbott/zulip,dhcrzf/zulip,mahim97/zulip,tommyip/zulip,jackrzhang/zulip,tommyip/zulip,andersk/zulip,amanharitsh123/zulip,timabbott/zulip,synicalsyntax/zulip,rht/zulip,punchagan/zulip,rht/zulip,timabbott/zulip,synicalsyntax/zulip,showell/zulip,eeshangarg/zulip,eeshangarg/zulip,jackrzhang/zulip,mahim97/zulip,shubhamdhama/zulip,Galexrt/zulip,rishig/zulip,zulip/zulip,hackerkid/zulip,andersk/zulip,synicalsyntax/zulip,verma-varsha/zulip,dhcrzf/zulip,rishig/zulip,mahim97/zulip,eeshangarg/zulip,dhcrzf/zulip,Galexrt/zulip,timabbott/zulip,kou/zulip,Galexrt/zulip,tommyip/zulip,brockwhittaker/zulip,tommyip/zulip,hackerkid/zulip,hackerkid/zulip,verma-varsha/zulip,rht/zulip,Galexrt/zulip,andersk/zulip,dhcrzf/zulip,Galexrt/zulip,rht/zulip,jackrzhang/zulip,dhcrzf/zulip,verma-varsha/zulip,amanharitsh123/zulip,showell/zulip,kou/zulip,dhcrzf/zulip,andersk/zulip,amanharitsh123/zulip,rht/zulip,amanharitsh123/zulip,punchagan/zulip,showell/zulip,shubhamdhama/zulip,punchagan/zulip,jackrzhang/zulip,eeshangarg/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,punchagan/zulip,shubhamdhama/zulip,timabbott/zulip,tommyip/zulip,showell/zulip,jackrzhang/zulip,rht/zulip,rishig/zulip,brainwane/zulip,verma-varsha/zulip,kou/zulip,brainwane/zulip,brainwane/zulip,tommyip/zulip,zulip/zulip,showell/zulip,brainwane/zulip,brockwhittaker/zulip,mahim97/zulip