Initial Ansible automation for homelab infrastructure

ansible/roles/promtail/defaults/main.yml

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+---
+promtail_host_label: "{{ inventory_hostname }}"

ansible/roles/promtail/handlers/main.yml

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+---
+- name: Restart promtail
+  systemd:
+    name: promtail
+    state: restarted

ansible/roles/promtail/tasks/main.yml

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+---
+- name: Install promtail
+  community.general.pacman:
+    name: promtail
+    state: present
+
+- name: Create promtail data directory
+  file:
+    path: /var/lib/promtail
+    state: directory
+    owner: promtail
+    group: promtail
+    mode: "0750"
+
+- name: Configure promtail
+  template:
+    src: promtail.yaml.j2
+    dest: /etc/loki/promtail.yaml
+    owner: root
+    group: root
+    mode: "0644"
+  notify: Restart promtail
+
+- name: Enable and start promtail
+  systemd:
+    name: promtail
+    enabled: true
+    state: started

ansible/roles/promtail/templates/promtail.yaml.j2

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+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /var/lib/promtail/positions.yaml
+
+clients:
+  - url: {{ loki_url }}/loki/api/v1/push
+
+scrape_configs:
+  - job_name: journal
+    journal:
+      max_age: 12h
+      labels:
+        job: systemd-journal
+        host: {{ promtail_host_label }}
+    relabel_configs:
+      - source_labels: [__journal__systemd_unit]
+        target_label: unit
+      - source_labels: [__journal__hostname]
+        target_label: hostname
+
+  - job_name: varlogs
+    static_configs:
+      - targets: [localhost]
+        labels:
+          job: varlogs
+          host: {{ promtail_host_label }}
+          __path__: /var/log/*.log