Releasing new versions of fabric-chaincode-wasm is currently a manual process.
Create a new fabric-chaincode-wasm release
Publish a docker image for use when running Wasm chaincode as an external service by following the instructions for Pushing a Docker container image to Docker Hub, e.g.
docker build -t hyperledgendary/fabric-chaincode-wasm .
docker tag hyperledgendary/fabric-chaincode-wasm hyperledgendary/fabric-chaincode-wasm:tag
docker push hyperledgendary/fabric-chaincode-wasm
docker push hyperledgendary/fabric-chaincode-wasm:tag