Add --skip-content-type-check option for skipping check of content type of assets.

[k1LoW]

Add option to skip content type check because sometimes the content type of assets are incorrect.

[github-actions]

Code Metrics Report

	main (7f4f16e)	#96 (5d83157)	+/-
Coverage	55.1%	55.1%	0.0%
Code to Test Ratio	1:0.2	1:0.2	-0.0
Test Execution Time	33s	27s	-6s

Details

  |                     | main (7f4f16e) | #96 (5d83157) | +/-  |
  |---------------------|----------------|---------------|------|
  | Coverage            |          55.1% |         55.1% | 0.0% |
  |   Files             |              3 |             3 |    0 |
  |   Lines             |            363 |           363 |    0 |
  |   Covered           |            200 |           200 |    0 |
- | Code to Test Ratio  |          1:0.2 |         1:0.2 | -0.0 |
  |   Code              |            579 |           581 |   +2 |
  |   Test              |            103 |           103 |    0 |
+ | Test Execution Time |            33s |           27s |  -6s |

Code coverage of files in pull request scope (50.8% → 50.8%)

Files	Coverage	+/-
gh/gh.go	50.8%	0.0%

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Reported by octocov