Added conditional installation guide for gnupg2

[7malikk]

Fixes #11479

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[codeclimate]

Code Climate has analyzed commit 2ed1057 and detected 0 issues on this pull request.

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[7malikk]

Hello, @cesswairimu @TildaDares kindly review my PR, its a fix for 11479

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8765631889/artifacts/397474995

[codecov]

Codecov Report

Merging #11480 (c595d9e) into main (21dfe4c) will increase coverage by 5.43%.
The diff coverage is n/a.

❗ Current head c595d9e differs from pull request most recent head 2ed1057. Consider uploading reports for the commit 2ed1057 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11480      +/-   ##
==========================================
+ Coverage   77.89%   83.33%   +5.43%     
==========================================
  Files          93       93              
  Lines        5877     5772     -105     
==========================================
+ Hits         4578     4810     +232     
+ Misses       1299      962     -337     

Impacted Files	Coverage Δ
app/models/node.rb	91.04% <0.00%> (+0.34%)	⬆️
app/models/user.rb	86.49% <0.00%> (+1.09%)	⬆️
app/controllers/user_sessions_controller.rb	67.48% <0.00%> (+1.22%)	⬆️
app/controllers/wiki_controller.rb	82.85% <0.00%> (+1.78%)	⬆️
app/models/image.rb	82.05% <0.00%> (+2.56%)	⬆️
app/models/spamaway.rb	97.43% <0.00%> (+2.56%)	⬆️
app/controllers/admin_controller.rb	80.24% <0.00%> (+5.76%)	⬆️
app/controllers/home_controller.rb	95.65% <0.00%> (+5.79%)	⬆️
app/controllers/users_controller.rb	80.78% <0.00%> (+9.25%)	⬆️
app/controllers/application_controller.rb	90.62% <0.00%> (+9.37%)	⬆️
... and 3 more

[cesswairimu]

Looks great 🎉 thanks for working on this

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