fix: never cache frontend files #893

Job	Run time
🐍 Prepare Python	27s
⬢ Prepare Node.js	22s
🔍 Check if pull request	3s
🧱 Build test matrix	8s
🧱 Build Spotlight	3m 18s
🗃 Build datasets	2m 43s
📝 Build API docs	54s
🔍 Check	2m 47s
🧪 Unit Test	1m 28s
🧪 Doc Test	1m 32s
🧪 UI Test (chrome)	4m 5s
🧪 UI Test (firefox)	4m 46s
🔍 Check wheel contents	41s
🧪 Integration Test (ubuntu-latest, 3.8)	11m 34s
🚀 Release Spotlight	0s
	34m 48s

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