Add Valkey tasks and templates

roles/valkey_server/defaults/main.yml

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+---
+valkey_version: 8.0.1
+valkey_user: valkey
+valkey_group: valkey
+
+# NETWORK
+valkey_protected_mode: true
+valkey_port: 6379
+valkey_tcp_backlog: 511
+valkey_timeout: 0
+valkey_tcp_keepalive: 300
+
+# TLS/SSL
+valkey_tls_protocols: TLSv1.2 TLSv1.3
+
+# GENERAL
+valkey_pid_file: /run/valkey.pid
+valkey_log_config:
+  level: notice
+  format: legacy
+  timestamp_format: legacy
+valkey_log_file: /var/log/valkey.log
+valkey_syslog:
+  enabled: false
+valkey_databases: 16
+valkey_locale_collate: ""
+
+# SNAPSHOTTING
+valkey_save: 3600 1 300 100 60 10000
+valkey_rdbcompression: true
+valkey_rdbchecksum: true
+valkey_dbfilename: dump.rdb
+valkey_rdb_del_sync_files: false
+valkey_dir: /var/lib/valkey
+
+# SECURITY
+valkey_acllog_max_len: 128
+valkey_acl-pubsub-default: resetchannels
+
+# CLIENTS
+valkey_maxclients: 10000
+
+# MEMORY MANAGEMENT
+valkey_maxmemory_policy: noeviction
+valkey_maxmemory_samples: 5
+valkey_maxmemory_eviction_tenacity: 10
+
+# APPEND ONLY MODE
+valkey_appendonly: false

roles/valkey_server/handlers/main.yml

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+---
+- name: Restart Valkey service
+  ansible.builtin.systemd_service:
+    name: valkey
+    daemon_reload: true
+    enabled: true
+    state: restarted

roles/valkey_server/templates/valkey.service.j2

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+# {{ ansible_managed }}
+
+[Unit]
+Description=Valkey data structure server
+Documentation=https://github.com/valkey-io/valkey-doc
+AssertPathExists={{ valkey_dir }}
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/usr/local/bin/valkey-server /etc/valkey/valkey.conf
+LimitNOFILE=10032
+NoNewPrivileges=yes
+#OOMScoreAdjust=-900
+#PrivateTmp=yes
+Type=notify
+TimeoutStartSec=infinity
+TimeoutStopSec=infinity
+UMask=0077
+User={{ valkey_user }}
+Group={{ valkey_group }}
+WorkingDirectory={{ valkey_dir }}
+
+[Install]
+WantedBy=multi-user.target