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/ci_package.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Runs package.sh setting the version to git hashes of the riot-web,
+# react-sdk & js-sdk checkouts, for the case where these dependencies
+# are git checkouts.
+
+set -e
+set -x
+
+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