CI: run ewasm-tests with geth+evmc+hera

[axic]

@gballet has pushed a branch to help running ewasm tests with geth: https://github.com/ewasm/go-ethereum/tree/wasm-testing

[chfast]

Currently, this is not easily doable, because go-ethereum will run Byzantium state tests in EVM mode (EWASM is not enabled in this config) even if --vm.ewasm=hera.so is specified.
You can add a hack like proposed .EnableWagon but I don't want to maintain it.

[gballet]

for reference, @chfast's PR ethereum/go-ethereum#18084

[axic]

@gballet @chfast I see the PR was merged, is it now possible to continue this work?

[chfast]

even if --vm.ewasm=hera.so is specified.

No.

[chfast]

This hack allows to run EWASM state tests in geth: ewasm/go-ethereum#7.

[gballet]

Actually that's what the fork rules are for, check ewasm/go-ethereum#9 That should work now; I'm seeking to activate travis to check, but I seem to have insufficient permissions @axic.