Add option validations

[kyoshidajp]

No description provided.

[github-actions]

Code Metrics Report

	main (859426c)	#12 (7b4625e)	+/-
Coverage	47.9%	46.4%	-1.5%
Code to Test Ratio	1:0.5	1:0.5	-0.0
Test Execution Time	40s	19s	-21s

Details

  |                     | main (859426c) | #12 (7b4625e) |  +/-  |
  |---------------------|----------------|---------------|-------|
- | Coverage            |          47.9% |         46.4% | -1.5% |
  |   Files             |              7 |             7 |     0 |
  |   Lines             |            240 |           248 |    +8 |
  |   Covered           |            115 |           115 |     0 |
- | Code to Test Ratio  |          1:0.5 |         1:0.5 |  -0.0 |
  |   Code              |            641 |           652 |   +11 |
  |   Test              |            321 |           321 |     0 |
+ | Test Execution Time |            40s |           19s |  -21s |

Code coverage of files in pull request scope (12.5% → 10.4%)

Files	Coverage	+/-
cmd/diagnose.go	10.4%	-2.1%

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Reported by octocov