feat(capytal,forgejo): set up forgejo actions runner

common/default.nix

@@ -4,5 +4,6 @@
     ./cloudflare.nix
     ./garage.nix
     ./postgresql.nix
+    ./virtualisation.nix
   ];
 }

common/virtualisation.nix

@@ -0,0 +1,13 @@
+{...}: {
+  virtualisation = {
+    oci-containers = {
+      backend = "podman";
+    };
+    podman = {
+      enable = true;
+      dockerCompat = true;
+      dockerSocket.enable = true;
+    };
+    docker.enable = false;
+  };
+}