Adapt rust playbook to new way of passing user

Author: klaus993

infra/ansible/rust.yaml

@@ -1,21 +1,22 @@
 - name: Rust Setup
   hosts: all
-  become: true
 
   pre_tasks:
     - name: update repositories
       apt: update_cache=yes
       become: true
-      changed_when: False
+      changed_when: false
+
   tasks:
     - name: check if cargo is installed
-      shell: . ~/.profile && cargo -v
+      become_user: '{{ app_user }}'
+      shell: /home/{{ app_user }}/.cargo/bin/cargo -v
       register: cargo_exists
       ignore_errors: true
 
     - name: Download Installer
-      become_user: "{{ app_user }}"
       when: cargo_exists is failed
+      become_user: '{{ app_user }}'
       get_url:
         url: https://sh.rustup.rs
         dest: /tmp/sh.rustup.rs
@@ -26,7 +27,7 @@
 
     - name: install rust/cargo
       when: cargo_exists is failed
-      shell: /tmp/sh.rustup.rs -y
       become_user: "{{ app_user }}"
+      shell: /tmp/sh.rustup.rs -y && rm /tmp/sh.rustup.rs
       tags:
         - rust