ansible: correctly handle non-default Nomad local code paths.

When using the remote build functionality, the local Nomad code
path was expected to be "nomad". This isn't the case for many
people, and therefore this change fixes the behaviour, so we can
handle all Nomad local code path names.

shared/ansible/hashicorp/nomad_bench/roles/build/defaults/main.yaml

@@ -9,3 +9,4 @@ build_apt_packages: [
 
 build_user: "ubuntu"
 build_nomad_local_code_path: ""
+build_nomad_local_code_dir_name: "{{ build_nomad_local_code_path | split('/') | last }}"

shared/ansible/hashicorp/nomad_bench/roles/build/tasks/main.yaml

@@ -42,17 +42,17 @@
 
   - name: "remove_nomad_binary"
     ansible.builtin.file:
-      path:  "/home/{{ build_user }}/nomad/pkg/linux_amd64/nomad"
+      path:  "/home/{{ build_user }}/{{ build_nomad_local_code_dir_name }}/pkg/linux_amd64/nomad"
       state: "absent"
 
   - name: "build_nomad_binary"
     shell: ". /etc/profile;make pkg/linux_amd64/nomad"
     args:
-      chdir: "/home/{{ build_user }}/nomad"
+      chdir: "/home/{{ build_user }}/{{ build_nomad_local_code_dir_name }}"
 
   - name: "fetch_nomad_compiled_binary"
     ansible.builtin.fetch:
-      src: "/home/{{ build_user }}/nomad/pkg/linux_amd64/nomad"
+      src: "/home/{{ build_user }}/{{ build_nomad_local_code_dir_name }}/pkg/linux_amd64/nomad"
       dest: "{{ build_nomad_local_code_path }}/pkg/linux_amd64/nomad"
       flat: yes