ci: liveness test doesn't seem to be using Go1.16+ hence doesn't compile

[odeke-em]

Noticed from all these failures on the master branch

for example https://github.com/cosmos/cosmos-sdk/runs/3905217253 which says

Status: Downloaded newer image for cosmossdk/rbuilder:latest
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git
rm -rf \
    /tmp/tmp.ua3W2PiJsq/buildsources/build/ \
    artifacts/ \
    tmp-swagger-gen/
Building for linux/amd64
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git
mkdir -p /tmp/tmp.ua3W2PiJsq/buildsources/build/
go build -mod=readonly -tags "netgo" -ldflags '-X github.com/cosmos/cosmos-sdk/version.Name=sim -X github.com/cosmos/cosmos-sdk/version.AppName=simd -X github.com/cosmos/cosmos-sdk/version.Version=717dcdfa8 -X github.com/cosmos/cosmos-sdk/version.Commit=717dcdfa8f86133a159617abb8ec9ea41857f7d1 -X "github.com/cosmos/cosmos-sdk/version.BuildTags=netgo" -X github.com/tendermint/tendermint/version.TMCoreSemVer=v0.34.13 -w -s -buildid=717dcdfa8' -trimpath -o /tmp/tmp.ua3W2PiJsq/buildsources/build/ ./...
# github.com/cosmos/cosmos-sdk/snapshots
snapshots/manager.go:146:9: undefined: io.ReadAll
snapshots/manager.go:241:17: undefined: io.NopCloser
note: module requires Go 1.17
# github.com/cosmos/cosmos-sdk/crypto/keyring
crypto/keyring/keyring.go:684:19: undefined: os.ReadFile
crypto/keyring/keyring.go:748:14: undefined: os.WriteFile
note: module requires Go 1.17
# github.com/cosmos/cosmos-sdk/server/grpc/gogoreflection
server/grpc/gogoreflection/serverreflection.go:221:14: undefined: io.ReadAll
note: module requires Go 1.17
# github.com/cosmos/cosmos-sdk/codec/unknownproto
codec/unknownproto/unknown_fields.go:361:20: undefined: io.ReadAll
note: module requires Go 1.17
make: *** [Makefile:115: build] Error 2
make: *** [Makefile:133: build-simd-linux] Error 2
Error: Process completed with exit code 2.

You'll see that it can't recognize io.ReadAll, io.NopCloser of which these were introduced in Go1.16 https://pkg.go.dev/io#ReadAll and I was one of the folks that worked on them; seems like code in here must be using Go1.15. This started in #10341

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[amaury1093]

I also had a quick look a couple of days ago, IMO this would help: tendermint/images#73 (comment)

[tac0turtle]

I may be looking in the wrong place, but i dont see this image being used?

[amaury1093]

liveness-test on CI calls make clean build-simd-linux localnet-start, then

cosmos-sdk/Makefile

Line 139 in acf823d

--name latest-build cosmossdk/rbuilder:latest