Change jenkins script to package script

Take the useful part of the jenkins script and put it in a script
that makes a package with the git hashes as its version.

scripts/jenkins.sh

@@ -1,31 +0,0 @@
-#!/bin/bash
-
-set -e
-
-export NVM_DIR="$HOME/.nvm"
-[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
-nvm use 10
-
-set -x
-
-# check out corresponding branches of dependencies.
-# clone the deps with depth 1: we know we will only ever need that one commit.
-`dirname $0`/fetch-develop.deps.sh --depth 1
-
-yarn install
-
-# run the mocha tests
-yarn test
-
-# run eslint
-yarn lintall -- -f checkstyle -o eslint.xml || true
-
-rm dist/riot-*.tar.gz || true # rm previous artifacts without failing if it doesn't exist
-
-# Since the deps are fetched from git, we can rev-parse
-REACT_SHA=$(cd node_modules/matrix-react-sdk; git rev-parse --short=12 HEAD)
-JSSDK_SHA=$(cd node_modules/matrix-js-sdk; git rev-parse --short=12 HEAD)
-
-VECTOR_SHA=$(git rev-parse --short=12 HEAD) # use the ACTUAL SHA rather than assume develop
-
-DIST_VERSION=$VECTOR_SHA-react-$REACT_SHA-js-$JSSDK_SHA scripts/package.sh -d