echo go checksum database

name:     sum.golang.dev.echohq.com
verifier: sum.golang.dev.echohq.com+5dc169ba+AdxVNyDmsBzixbeZY9MgmHaUycGvEoAzb40UvjvdIfNZ

Serves only +echo.N module versions and golang.org/toolchain. Lookups for
anything else return 404; those modules belong to sum.golang.org.

  GOSUMDB="sum.golang.dev.echohq.com+5dc169ba+AdxVNyDmsBzixbeZY9MgmHaUycGvEoAzb40UvjvdIfNZ https://sum.golang.dev.echohq.com"

Endpoints: /lookup/<module>@<version>  /latest  /tile/...  /health  /ready  /startup