Cache "go-build" containing cached build artifacts from the Go build system.
This saves up to:
  - 6 min on Linux (from 10 min to 4 min)
  - 3 min on macOS  (from 13 min to 10 min)
  - 7 min on Windows (from 27 min to 20 min)

Cache Windows deps (mingw, cmake).
This saves 6,5 min on Windows builds (from 20 min to 13,5 min)

* binary tree

* Binary commitment tree

* [erigon2] Bin tree support

* Point to latest erigon-lib

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

--- FAIL: TestUDPv4_LookupIterator (1.36s)
155
    v4_lookup_test.go:168: handlePacket error: "unsolicited reply"
156

Running on PR close event tests the PR commit, not the final merged commit.
The final commit is tested by "push" event, but it appears as "skipped" in the list of devel ccmmits,
because "push" event was skipped by "if".

* save

* save

* penalize naughty peers

* lint

* Update version.go

* Fix lint

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

* Undo headers relaxation change

* Undo headers relaxation change

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>

The UDP test must be closed after the serveTestnet exits.
If it happens before, the serveTestnet encounters this error.
(it tries to emulate a packet receival after closing the transport)

FindNode triggers a Ping in ensureBond.
This causes an extra Sleep for "ping back".
Don't wait for this in tests.

Close v5 tests.

The requests may also timeout if a lot of them queue up in the udpTest.pipe,
and serveTestnet is slow to process them.
Increase replyTimeout a bit to prevent that.

* Update node.go

* Update node.go

This reverts commit e758fb80.

* More relax inclusion of headers in the downloader

* Fix

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* refactor test
* add a fast fixed examples test for the main suite
* split slow test for the integration suite

`cfg` is not a pointer

* speed up docker image build by use layer cache

* rearrenge Dockerfile

* enable docker layer cache in github action

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* print branchHash

* Print state changes

* Print val

* Fix for author

* Remove prints

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* save

* save

* save

* save

* save

* save

* save

* save

* save

* save

* save

* save

* save

* Update stageloop.go

* Print

* Consider snapshot headers as parlia checkpoints

* Not fail after not loading snapshot

* Lazy snapshots

* Print number of validators

* More printing

* Use epoch instead of checkpoint interval

* Reduce logging

* Fix compilation

* Remove trace jump dest

* Fix lint

* Not store snapshots every epoch

* Separate snapshot for verification and finalisation

Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>
Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* exchange RLPx Hello even when maxpeers limit is reached
* bump MaxPendingPeers to increase the default handshake queue
  (and the likelyhood of Hello exchange)