discovery: create all.bash
discovery: create all.bash

An all.bash file is created, which:
- clones sso://sos/sos if it does not exist
- updates and runs staticcheck
- runs go mod tidy
- runs all tests
- checks all .go and .sql files for a license header

Change-Id: Icdc85a7befe9f524fce69e4484c9978995de3e3a
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/436924
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite