test: improve performance of tests by caching repos

[Panaetius]

cache repos in tests

Execution times for comparison:
Before (average of 4 runs of CI):
test-linux-cli: 35:08
test-macos-cli: 1:41:05
Total for test-deploy Action: 2:30:51

After (avg from two runs):
test-linux-cli: 24:50
test-macos-cli: 1:21:30
total: 1:31:59

[coveralls]

Pull Request Test Coverage Report for Build 7486783893

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 85.458%

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Totals
Change from base Build 7414051779:	0.05%
Covered Lines:	26434
Relevant Lines:	30932

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💛 - Coveralls