feat: Flake | revamp entire flake (#1)

Reviewed-on: #1

hosts/common/optional/docker.nix

@@ -0,0 +1,47 @@
+{
+  pkgs,
+  ...
+}: {
+  virtualisation = {
+    podman = {
+      enable = true;
+      dockerSocket.enable = true;
+      dockerCompat = true;
+
+      autoPrune = {
+        enable = true;
+        dates = "weekly";
+      };
+    };
+
+    containers = {
+      registries = {
+        search = ["docker.io"];
+      };
+    };
+
+    libvirtd = {
+      enable = true;
+      qemu = {
+        swtpm.enable = true;
+
+        ovmf = {
+          enable = true;
+          packages = with pkgs; [OVMFFull.fd];
+        };
+      };
+    };
+
+    spiceUSBRedirection.enable = true;
+  };
+
+  environment.systemPackages = with pkgs; [
+    virt-manager
+    virt-viewer
+    spice
+    spice-gtk
+    spice-protocol
+    win-virtio
+    win-spice
+  ];
+}