Liveness Test fails in Github Actions

[evan-forbes]

Currently, the liveness test in Github Actions fails. The failing action is calling make clean build-simd-linux localnet-start, and the resulting error is:

Status: Downloaded newer image for cosmossdk/rbuilder:latest
/sources/.build.sh: line 14: /usr/local/share/cosmos-sdk/buildlib.sh: No such file or directory
Makefile:127: recipe for target 'build-simd-linux' failed
make: *** [build-simd-linux] Error 1

I think this has to do with the usage of the latest version of the docker images in the build-simd-linux make command

build-simd-linux: go.sum $(BUILDDIR)/
	$(DOCKER) rm latest-build || true
	$(DOCKER) run --volume=$(CURDIR):/sources:ro \
        --env TARGET_PLATFORMS='linux/amd64' \
        --env APP=simd \
        --env VERSION=$(VERSION) \
        --env COMMIT=$(COMMIT) \
        --env LEDGER_ENABLED=false \
        --name latest-build cosmossdk/rbuilder:latest
	$(DOCKER) cp -a latest-build:/home/builder/artifacts/ $(CURDIR)/
	cp artifacts/simd-*-linux-amd64 $(BUILDDIR)/simd

ref: PR#13

[liamsi]

@tzdybal @evan-forbes rebase onto or merge in master shoudl fix your PR builds too