Create initial checkpoint for nodes withtout startup config too

[hellt]

To use reverting to initial checkpoint for these nodes as well.

[codecov[bot]]

Codecov Report

Merging #39 (15d7f58) into main (d972166) will increase coverage by 0.14%. The diff coverage is 38.09%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   50.79%   50.93%   +0.14%     
==========================================
  Files           8        8              
  Lines         758      799      +41     
==========================================
+ Hits          385      407      +22     
- Misses        346      365      +19     
  Partials       27       27              

Impacted Files	Coverage Δ
api/v1/srlinux_types.go	100.00% <ø> (ø)
controllers/startup_config.go	0.00% <0.00%> (ø)
controllers/pod.go	85.22% <100.00%> (+1.79%)	:arrow_up: