Rename repo to cosmwasm/libwasmvm-builder and bump version

Author: webmaster128

Makefile

@@ -1,7 +1,7 @@
 .PHONY: all build build-rust build-go test
 
 # Builds the Rust library libwasmvm
-BUILDERS_PREFIX := cosmwasm/go-ext-builder:0019
+BUILDERS_PREFIX := cosmwasm/libwasmvm-builder:0020-dev
 # Contains a full Go dev environment including CGO support in order to run Go tests on the built shared library
 # This image is currently not published.
 ALPINE_TESTER := cosmwasm/alpine-tester:local

builders/Makefile

@@ -1,6 +1,6 @@
 # Versioned by a simple counter that is not bound to a specific CosmWasm version
 # See builders/README.md
-BUILDERS_PREFIX := cosmwasm/go-ext-builder:0019
+BUILDERS_PREFIX := cosmwasm/libwasmvm-builder:0020-dev
 
 .PHONY: docker-image-debian
 docker-image-debian:

builders/README.md

@@ -14,13 +14,18 @@ any machine that can run Docker can do the cross-compilation.
 
 ## Docker Hub images
 
-See https://hub.docker.com/r/cosmwasm/go-ext-builder/tags for all available
-versions of the builder images.
+See those DockerHub repos for all available versions of the builder images.
+
+- From 0020: https://hub.docker.com/r/cosmwasm/libwasmvm-builder/tags
+- Until 0019: https://hub.docker.com/r/cosmwasm/go-ext-builder/tags
 
 ## Changelog
 
 **Unreleased**
 
+- Rename builder image from cosmwasm/go-ext-builder to
+  cosmwasm/libwasmvm-builder
+
 **Version 0019:**
 
 - Bump `OSX_VERSION_MIN` to 10.15.