add releaser metadata

Author: eli-darkly

.ldrelease/build.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+npm install
+npm run lint
+npm run check-typescript
+
+# Running the unit tests would require installing DynamoDB, which is slow. They've already been run in CI.

.ldrelease/config.yml

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+npm publish

.ldrelease/publish.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+PACKAGE_JSON_TEMP=./package.json.tmp
+sed "s/\"version\".*/\"version\": \"${LD_RELEASE_VERSION}\",/g" package.json > ${PACKAGE_JSON_TEMP}
+mv ${PACKAGE_JSON_TEMP} package.json