[WEBSITE-1272] Unify GIT environment variables in Makefile
[WEBSITE-1272] Unify GIT environment variables in Makefile

ukparliament/parliament.uk-prototype,cwaszczuk/parliament.uk-prototype,vinternet-pds/parliament.uk-prototype,C-N-J/parliament.uk-prototype,vinternet-pds/parliament.uk-prototype,C-N-J/parliament.uk-prototype,cwaszczuk/parliament.uk-prototype,ukparliament/parliament.uk-prototype,cwaszczuk/parliament.uk-prototype,vinternet-pds/parliament.uk-prototype,ukparliament/parliament.uk-prototype,ukparliament/parliament.uk-prototype,vinternet-pds/parliament.uk-prototype,C-N-J/parliament.uk-prototype,cwaszczuk/parliament.uk-prototype,C-N-J/parliament.uk-prototype