set file mode explicitly when downloading binary

Set file mode explicitly when downloading binary because the default mode has changed after this [security fix](ansible/ansible#67794) was introduced in ansible.

Fixes: #177.

Author: fprojetto

tasks/install.yml

@@ -24,6 +24,7 @@
         url: "https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
         dest: "/tmp/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
         checksum: "sha256:{{ node_exporter_checksum }}"
+        mode: '0666'
       register: _download_binary
       until: _download_binary is succeeded
       retries: 5