Turned this idiom into a script

Author: kohsuke

README.md

@@ -50,10 +50,8 @@ module to PyPI.
 ## How to update launchable/jar/exe_deploy.jar
 
 ```
-bazel build //src/main/java/com/launchableinc/ingest/commits:exe_deploy.jar
-bazel test //...
-cp bazel-bin/src/main/java/com/launchableinc/ingest/commits/exe_deploy.jar launchable/jar/exe_deploy.jar
- ```
+./build-java.sh
+```
 
 # Installing CLI
 

build-java.sh

@@ -0,0 +1,5 @@
+#!/bin/bash -ex
+bazel build //src/main/java/com/launchableinc/ingest/commits:exe_deploy.jar
+bazel test //...
+cp bazel-bin/src/main/java/com/launchableinc/ingest/commits/exe_deploy.jar launchable/jar/exe_deploy.jar
+