Raise when JF_DIST_NODE_NAME is not set in release mode

[mickel8]

We can't use jellyfish as default node name when we also use longnames as default distribution mode. Therefore it is better to just raise. That's also symmetric with the behavior when running from source

[codecov[bot]]

Codecov Report

Merging #101 (8f3b9b5) into main (9625b3a) will increase coverage by 0.08%. Report is 1 commits behind head on main. The diff coverage is 85.71%.

:exclamation: Current head 8f3b9b5 differs from pull request most recent head 3e96eaf. Consider uploading reports for the commit 3e96eaf to get more accurate results

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   83.48%   83.56%   +0.08%     
==========================================
  Files          44       44              
  Lines         769      779      +10     
==========================================
+ Hits          642      651       +9     
- Misses        127      128       +1     

Files	Coverage Δ
lib/jellyfish/application.ex	47.82% <100.00%> (+10.98%)	:arrow_up:
lib/jellyfish/config_reader.ex	100.00% <100.00%> (ø)
lib/jellyfish/peer/webrtc.ex	48.27% <50.00%> (ø)
lib/jellyfish/room.ex	81.88% <87.50%> (+0.14%)	:arrow_up:
lib/jellyfish_web/telemetry.ex	88.88% <50.00%> (-11.12%)	:arrow_down:

... and 1 file with indirect coverage changes

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