Fix for Oracle ZIP Location

Why these changes are being introduced:
The previous Makefile had a hardcoded name for an S3 bucket that holds
a copy of the Oracle library .zip file. This makes that S3 bucket name
dynamic to match the dev/stage/prod account from which it should be
pulled.

How this addresses that need:
* Update the environment variable definitions in the Makefile

Side effects of this change:

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/IN-615

Makefile

@@ -10,8 +10,8 @@ ECR_URL_DEV:=222053980223.dkr.ecr.us-east-1.amazonaws.com/carbon-dev
 ### End of Terraform-generated header                            ###
 
 SHELL=/bin/bash
-S3_BUCKET=shared-files-222053980223
-ORACLE_ZIP=instantclient-basiclite-linux.x64-18.3.0.0.0dbru.zip
+S3_BUCKET:=shared-files-$(shell aws sts get-caller-identity --query "Account" --output text)
+ORACLE_ZIP:=instantclient-basiclite-linux.x64-18.3.0.0.0dbru.zip
 DATETIME:=$(shell date -u +%Y%m%dT%H%M%SZ)
 
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