server: return next_actions data on create

[ghost]

When a server is created, it can return a field next_actions containing actions that will be executed after the server was created. Most commonly, this contains start_server. But for example if we directly pass networks or firewalls, it also contains the actions for adding the server to the network or applying the firewall to the server.

To cleanly start a server and wait for all actions to complete, we need to know these next_actions.

Example from a test run:

# next_actions = 
[
#<Hcloud::Action:0x924 {"id"=>881261022, "command"=>"start_server", "status"=>"running", "progress"=>0,
"started"=>2023-01-27 12:51:55 +0000, "finished"=>nil, "resources"=>[{"id"=>28067295, "type"=>"server"}],
"error"=>nil}>,
#<Hcloud::Action:0x938 {"id"=>881261023, "command"=>"attach_to_network",
"status"=>"running", "progress"=>0, "started"=>2023-01-27 12:51:55 +0000, "finished"=>nil,
"resources"=>[{"id"=>28067295, "type"=>"server"}, {"id"=>2450993, "type"=>"network"}],
"error"=>nil}>
]

[codecov-commenter]

Codecov Report

Merging #72 (4329f3f) into master (170a91a) will decrease coverage by 0.03%.
The diff coverage is 80.00%.

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@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   98.42%   98.40%   -0.03%     
==========================================
  Files         119      119              
  Lines        4266     4269       +3     
==========================================
+ Hits         4199     4201       +2     
- Misses         67       68       +1     

Impacted Files	Coverage Δ
lib/hcloud/server_resource.rb	91.66% <0.00%> (-8.34%)	⬇️
spec/hcloud/server_spec.rb	100.00% <100.00%> (ø)

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