Fix missing Mastodon/PosgreSQL backups

The backup cookbook was incomplete, and also there was no database
configured to be backed up.

site-cookbooks/backup/attributes/default.rb

@@ -26,6 +26,11 @@ set_unless["backup"]["mysql"]["databases"] = []
 set_unless["backup"]["mysql"]["username"]  = "root"
 set_unless["backup"]["mysql"]["host"]      = "localhost"
 
+# PostgreSQL default settings
+set_unless["backup"]["postgresql"]["databases"] = []
+set_unless["backup"]["postgresql"]["host"]      = "localhost"
+set_unless["backup"]["postgresql"]["port"]      = 5432
+
 # Redis default settings
 set_unless["backup"]["redis"]["databases"]   = []
 set_unless["backup"]["redis"]["host"]        = "localhost"

site-cookbooks/backup/templates/default/backup.rb.erb

@@ -17,7 +17,11 @@ KosmosBackup.new(:default, 'default backup') do
 <%- end -%>
 
 <%- if node["backup"]["postgresql"] -%>
-  database PostgreSQL
+<%- node["backup"]["postgresql"]["databases"].each do |db_name| -%>
+  database PostgreSQL, :"<%= db_name.to_sym %>" do |db|
+    db.name = "<%= db_name %>"
+  end
+<%- end -%>
 <%- end -%>
 
 <%- if node["mongodb"] -%>

site-cookbooks/backup/templates/default/config.rb.erb

@@ -45,15 +45,7 @@ Database::MySQL.defaults do |db|
 end
 <%- end -%>
 
-<%- if node["backup"]["mysql"] -%>
-Database::MySQL.defaults do |db|
-  db.host               = "<%= node["backup"]["mysql"]["host"] %>"
-  db.username           = "<%= node["backup"]["mysql"]["username"] %>"
-  db.password           = "<%= node["backup"]["mysql"]["password"] %>"
-  db.additional_options = ['--quick', '--single-transaction']
-end
-<%- end -%>
-
+<%- if node["backup"]["redis"] -%>
 Database::Redis.defaults do |db|
   db.host               = "<%= node["backup"]["redis"]["host"] %>"
   db.port               = 6379
@@ -61,13 +53,14 @@ Database::Redis.defaults do |db|
   <%# db.password           = "my_password"%>
   <%# db.socket             = "/tmp/redis.sock"%>
 end
+<%- end -%>
 
 <%- if node["backup"]["postgresql"] -%>
 Database::PostgreSQL.defaults do |db|
   db.username           = "<%= node["backup"]["postgresql"]["username"] %>"
   db.password           = "<%= node["backup"]["postgresql"]["password"] %>"
   db.host               = "<%= node["backup"]["postgresql"]["host"] %>"
-  db.port               = 5432
+  db.port               = "<%= node["backup"]["postgresql"]["port"] %>"
   # db.socket             = "/var/run/postgresql/.s.PGSQL.5432"
   # When dumping all databases, `skip_tables` and `only_tables` are ignored.
   db.skip_tables        = []