## Issue Addressed
NA
## Proposed Changes
Adds support for using the [`cross`](https://github.com/rust-embedded/cross) project to produce cross-compiled binaries using Docker images.
Provides quite clean and simple cross-compiles cause all the complexity is hidden in Dockerfiles. It does require you to be in the `docker` group though.
## Details
- Adds shortcut commands to `Makefile`
- Ensures `reqwest` and `discv5` use vendored openssl libs (i.e., static not shared).
- Switches to a [commit](284f705964) of blst that has a renamed C function to avoid a collision with openssl (upstream issue: https://github.com/supranational/blst/issues/21).
- Updates `ring` to the latest satisfiable version, since an earlier version was causing issues with `cross`.
- Off-topic, but adds extra message about Windows support as suggested by Discord user.
## Additional Info
- ~~Blocked on #1495~~
- There are no tests in CI for this yet for a few reasons:
- I'm hesitant to add more long-running tasks.
- Short-term bitrot should be avoided since we'll use it each release.
- In the long term I think it would be good to automate binary creation on a release.
- I observed the binaries increase in size from 50mb to 52mb after these changes.
## Issue Addressed
NA
## Proposed Changes
Allows for multiple "hardcoded" testnets.
## Additional Info
This PR is incomplete.
## TODO
- [x] Add flag to CLI, integrate with rest of Lighthouse.
Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>
Co-authored-by: Michael Sproul <michael@sigmaprime.io>
* Add logging on shutdown
* Replace tokio::spawn with handle.spawn
* Upgrade tokio
* Add a task executor
* Beacon chain tasks use task executor
* Validator client tasks use task executor
* Rename runtime_handle to executor
* Add duration histograms; minor fixes
* Cleanup
* Fix logs
* Fix tests
* Remove random file
* Get enr dependency instead of libp2p
* Address some review comments
* Libp2p takes a TaskExecutor
* Ugly fix libp2p tests
* Move TaskExecutor to own file
* Upgrade Dockerfile rust version
* Minor fixes
* Revert "Ugly fix libp2p tests"
This reverts commit 58d4bb690f52de28d893943b7504d2d0c6621429.
* Pretty fix libp2p tests
* Add spawn_without_exit; change Counter to Gauge
* Tidy
* Move log from RuntimeContext to TaskExecutor
* Fix errors
* Replace histogram with int_gauge for async tasks
* Fix todo
* Fix memory leak in test by exiting all spawned tasks at the end
* Update state processing for v0.12
* Fix EF test runners for v0.12
* Fix some tests
* Fix broken attestation verification test
* More test fixes
* Fix typo found in review
