integrate sops-nix for secret management

modules/system/homelab/sops.nix

@@ -0,0 +1,59 @@
+{ config, ... }: {
+  sops = {
+    defaultSopsFile = ../../../secrets/homelab.yaml;
+    age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+
+    secrets = {
+      cloudflare_dns_api_token = {
+        owner = "acme";
+        group = "acme";
+      };
+
+      cloudflared_tunnel_credentials = {
+        owner = "cloudflared";
+        group = "cloudflared";
+      };
+
+      cloudflared_cert = {
+        owner = "cloudflared";
+        group = "cloudflared";
+      };
+
+      vaultwarden_env = {
+        owner = "vaultwarden";
+        group = "vaultwarden";
+        restartUnits = [ "vaultwarden.service" ];
+      };
+
+      glance_env = {
+        owner = "glance";
+        group = "glance";
+        restartUnits = [ "glance.service" ];
+      };
+
+      pocketid_encryption_key = {
+        owner = "root";
+        group = "root";
+        restartUnits = [ "pocket-id.service" ];
+      };
+
+      tailscale_authkey = {
+        owner = "root";
+        group = "root";
+        restartUnits = [ "tailscaled.service" ];
+      };
+
+      nginx_htpasswd = {
+        owner = "nginx";
+        group = "nginx";
+        restartUnits = [ "nginx.service" ];
+      };
+    };
+
+    templates."cloudflare.env" = {
+      owner = "acme";
+      group = "acme";
+      content = "CLOUDFLARE_DNS_API_TOKEN=${config.sops.placeholder.cloudflare_dns_api_token}";
+    };
+  };
+}