unionfs: support more branches by splitting into multiple lines

closes #237

roles/unionfs/defaults/main.yml

@@ -76,6 +76,18 @@ mergerfs_mount_start_command: |-
     -o dropcacheonclose=true,minfreespace=0,fsname=mergerfs \
     -o xattr={{ mergerfs_mount_xattr }},statfs=base,statfs_ignore=nc,umask={{ mergerfs_mount_umask }},noatime \
     -o func.readdir={{ mergerfs_mount_readdir_policy }} \
-    {{ mergerfs_mount_branches }} /mnt/unionfs
+  {% set branches = mergerfs_mount_branches.split(':') %}
+  {%- for branch in branches %}
+  {% if loop.index0 is divisibleby 10 and not loop.first %}
+  \
+  {% endif %}
+  {% if loop.first %}
+  {% filter indent(2, first=True) -%}
+  {%- if loop.first -%}"{%- endif -%}{{ branch }}{%- if not loop.last -%}:{%- endif %}
+  {%- endfilter %}
+  {% else %}
+  {{ branch}}{%- if not loop.last -%}:{%- endif %}
+  {% endif %}
+  {%- endfor %}" /mnt/unionfs
 
 mergerfs_mount_stop_command: /bin/fusermount3 -uz /mnt/unionfs