outsource melscale to different file #1480

Job	Run time
🔍 Check if pull request	3s
🐍 Prepare Python	31s
⬢ Prepare Node.js	16s
🧱 Build test matrix	21s
🔍 Check	2m 24s
📝 Build API docs	42s
🧱 Build Spotlight	2m 3s
🗃 Build datasets	1m 41s
🧪 Doc Test	1m 34s
🧪 Unit Test	1m 12s
🧪 Integration Test (ubuntu-latest, 3.8)	10m 34s
🧪 UI Test (chrome)	2m 35s
🔍 Check wheel contents	25s
🧪 UI Test (firefox)	3m 5s
🚀 Release Spotlight	0s
	27m 26s

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