[fix] (blackblox-exporter) Update hardcoded install path

Signed-off-by: Emmanuel Bilheude <ebilheude@dotscreen.com>

roles/blackbox_exporter/tasks/install.yml

@@ -78,7 +78,7 @@
 
 - name: Ensure blackbox exporter binary has cap_net_raw capability
   community.general.capabilities:
-    path: '/usr/local/bin/blackbox_exporter'
+    path: "{{ blackbox_exporter_binary_install_dir }}/blackbox_exporter"
     capability: cap_net_raw+ep
     state: present
   when: not ansible_check_mode

roles/blackbox_exporter/templates/blackbox_exporter.service.j2

@@ -11,7 +11,7 @@ User={{ blackbox_exporter_user }}
 Group={{ blackbox_exporter_group }}
 PermissionsStartOnly=true
 ExecReload=/bin/kill -HUP $MAINPID
-ExecStart=/usr/local/bin/blackbox_exporter \
+ExecStart={{ blackbox_exporter_binary_install_dir }}/blackbox_exporter \
   --config.file={{ blackbox_exporter_config_dir }}/blackbox_exporter.yml \
   {% for flag, flag_value in blackbox_exporter_cli_flags.items() -%}
   --{{ flag }}={{ flag_value }} \