feat: Add echo provisioner (#162)

This replaces the cdr-basic provisioner type with
"echo". It reads binary data from the directory
and returns the responses in order.

This is used to test project and workspace job logic.

database/dump.sql

@@ -52,8 +52,8 @@ CREATE TYPE provisioner_job_type AS ENUM (
 );
 
 CREATE TYPE provisioner_type AS ENUM (
-    'terraform',
-    'cdr-basic'
+    'echo',
+    'terraform'
 );
 
 CREATE TYPE userstatus AS ENUM (