Add grafana_alloy role: scrape log files to Loki

roles/grafana_alloy/README.md

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+# grafana_alloy
+
+Install Grafana Alloy binary from GitHub.
+
+Install Grafana Alloy from the release binary and configures it to scrape log files and push them to Loki. RHEL / CentOS / Rocky. 
+
+## Variables
+
+```yaml
+alloy_version: "1.17.1"
+alloy_config_dir: "/etc/alloy"
+alloy_data_dir: "/var/lib/alloy"
+alloy_loki_url: "http://localhost:3100/loki/api/v1/push"
+alloy_log_paths:
+  - "/var/log/*.log"
+```
+
+## Usage
+
+```yaml
+- hosts: log_shippers
+  become: true
+  roles:
+    - role: grafana_alloy
+      vars:
+        alloy_loki_url: "http://loki.example.com:3100/loki/api/v1/push"
+        alloy_log_paths:
+          - "/var/log/*.log"
+          - "/var/log/myapp/*.log"
+```