feat: Make wireplumber write-able for later use with steamdeck-dsp

Containerfile

@@ -645,6 +645,7 @@ RUN /tmp/image-info.sh && \
         systemctl disable gdm.service && \
         systemctl enable sddm.service \
     ; fi && \
+    systemctl enable wireplumber-workaround.service && \
     systemctl enable bazzite-autologin.service && \
     systemctl enable wireplumber-sysconf.service && \
     systemctl enable btrfs-dedup@run-media-mmcblk0p1.timer && \

system_files/deck/shared/usr/lib/systemd/system/wireplumber-workaround.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Workaround wireplumber needing to be written into by steamdeck-dsp
+ConditionPathExists=/usr/share/wireplumber
+After=local-fs.target
+
+[Service]
+Type=oneshot
+# Copy if it doesn't exist
+ExecStartPre=/usr/bin/bash -c "[ -d /usr/local/share/.wireplumber ] || /usr/bin/cp -r /usr/share/wireplumber /usr/local/share/.wireplumber"
+ExecStart=/usr/bin/mount --bind /usr/local/share/.wireplumber /usr/share/wireplumber
+# Clean-up after ourselves
+ExecStop=/usr/bin/umount /usr/share/wireplumber
+ExecStop=/usr/bin/rm -r /usr/local/share/.wireplumber
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

system_files/deck/shared/usr/lib/tmpfiles.d/wireplumber-workaround.conf

@@ -0,0 +1 @@
+C /usr/local/share/.wireplumber - - - - /usr/share/wireplumber