ci: Add bionic production job in Circle CI.
ci: Add bionic production job in Circle CI.

We now replaced our production suites to run on circle ci
that too on bionic docker image.

brainwane/zulip,eeshangarg/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,showell/zulip,timabbott/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,shubhamdhama/zulip,andersk/zulip,zulip/zulip,andersk/zulip,zulip/zulip,andersk/zulip,synicalsyntax/zulip,showell/zulip,zulip/zulip,synicalsyntax/zulip,shubhamdhama/zulip,timabbott/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,rht/zulip,punchagan/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,timabbott/zulip,zulip/zulip,rht/zulip,hackerkid/zulip,timabbott/zulip,showell/zulip,eeshangarg/zulip,brainwane/zulip,eeshangarg/zulip,shubhamdhama/zulip,andersk/zulip,andersk/zulip,rht/zulip,hackerkid/zulip,synicalsyntax/zulip,brainwane/zulip,rht/zulip,punchagan/zulip,brainwane/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,synicalsyntax/zulip,timabbott/zulip,kou/zulip,showell/zulip,showell/zulip,shubhamdhama/zulip,zulip/zulip,hackerkid/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,hackerkid/zulip,brainwane/zulip,kou/zulip,synicalsyntax/zulip,kou/zulip,showell/zulip,kou/zulip,brainwane/zulip,timabbott/zulip,timabbott/zulip,kou/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,zulip/zulip,punchagan/zulip,zulip/zulip