feat: generate nonce and use it #5306

Job	Run time
file_changes	4s
Build Docker image	7m 14s
Build application and assets	6m 20s
Linting / Elixir	3m 36s
Linting / JavaScript	25s
Unit tests / JavaScript / Mocha	44s
Linting / TypeScript	47s
Unit tests / JavaScript & TypeScript / Jest	2m 18s
Linting / CSS	24s
Formatting / Elixir	3m 16s
Formatting / JavaScript & TypeScript	33s
Type checks / Elixir	3m 55s
Type checks / TypeScript	44s
Unit tests / Elixir / mix coveralls.html	54s
	31m 14s

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