feat(playout): configure device for alsa and pulseaudio system outputs (#2654)

### Description

Add hardware configuration to liquidsoap so that users may
set hardware output in config.yml.

---------

Co-authored-by: jo <ljonas@riseup.net>

playout/tests/liquidsoap/__snapshots__/entrypoint_test.ambr

@@ -315,7 +315,10 @@
   log("output.pulseaudio is not defined!")
   %endif
   %ifdef output.pulseaudio
-  output.pulseaudio(id="pulseaudio:1", s)
+  output.pulseaudio(
+    id="pulseaudio:1",
+    s
+  )
   %endif
   
   
@@ -355,6 +358,55 @@
   
   %include "/fake/1.4/ls_script.liq"
   
+  # pulseaudio:1
+  %ifndef output.pulseaudio
+  log("output.pulseaudio is not defined!")
+  %endif
+  %ifdef output.pulseaudio
+  output.pulseaudio(
+    id="pulseaudio:1",
+    device="alsa_output.pci-0000_00_sink",
+    s
+  )
+  %endif
+  
+  
+  
+  gateway("started")
+  
+  '''
+# ---
+# name: test_generate_entrypoint[stream_config7-1.4]
+  '''
+  # THIS FILE IS AUTO GENERATED. PLEASE DO NOT EDIT!
+  ###########################################################
+  # The ignore() lines are to squash unused variable warnings
+  
+  # Inputs
+  input_main_mount = "main"
+  input_main_port = 8001
+  input_main_secure = false
+  input_show_mount = "show"
+  input_show_port = 8002
+  input_show_secure = false
+  
+  # Settings
+  set("log.file.path", "/var/log/radio.log")
+  
+  set("server.telnet", true)
+  set("server.telnet.bind_addr", "127.0.0.1")
+  set("server.telnet.port", 1234)
+  
+  set("harbor.bind_addrs", ["0.0.0.0"])
+  
+  station_name = interactive.string("station_name", "LibreTime")
+  
+  message_offline = interactive.string("message_offline", "LibreTime - offline")
+  message_format = interactive.string("message_format", "0")
+  input_fade_transition = interactive.float("input_fade_transition", 0.0)
+  
+  %include "/fake/1.4/ls_script.liq"
+  
   
   
   gateway("started")

playout/tests/liquidsoap/fixtures/__init__.py

@@ -92,6 +92,17 @@ TEST_STREAM_CONFIGS: List[Config] = [
             "system": [{"enabled": True, "kind": "pulseaudio"}],
         }
     ),
+    make_config_with_stream(
+        outputs={
+            "system": [
+                {
+                    "enabled": True,
+                    "kind": "pulseaudio",
+                    "device": "alsa_output.pci-0000_00_sink",
+                }
+            ],
+        }
+    ),
     make_config_with_stream(
         outputs={
             "system": [{"enabled": False, "kind": "alsa"}],