alloy(role): pull in alloy role that works from fux (#112)

Reviewed-on: #112
Reviewed-by: June <june@noreply.git.hamburg.ccc.de>

roles/alloy/meta/argument_specs.yaml

@@ -0,0 +1,19 @@
+argument_specs:
+  main:
+    options:
+      alloy_config_default:
+        type: str
+        required: true
+      alloy_config_additional:
+        type: str
+        required: false
+      alloy_blackbox_exporter_config_default:
+        type: str
+        required: false
+      alloy_blackbox_exporter_config_additional:
+        type: str
+        required: false
+      alloy_cap_net_bind_service:
+        type: bool
+        required: false
+        default: false