refactor(contrib): Fix error log when trivy scan failed

[wadda0714]

What did you implement:

Fix error log when uploading results of trivy runs using trivy-to-vuls and future-vuls

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

previous errorlog

trivy image python:3.4-alpin -f json |./trivy-to-vuls parse --stdin | ./future-vuls upload --stdin --group-id 2603 --token fvgr-528ec289-2516-11ee-b1e6-0a58a9feac02 --uuid 506b2ede-ebf8-82da-f25f-43932a5d290
2023-09-22T16:05:28.733+0900	INFO	Vulnerability scanning is enabled
2023-09-22T16:05:28.733+0900	INFO	Secret scanning is enabled
2023-09-22T16:05:28.733+0900	INFO	If your scanning is slow, please try '--scanners vuln' to disable secret scanning
2023-09-22T16:05:28.733+0900	INFO	Please see also https://aquasecurity.github.io/trivy/v0.44/docs/scanner/secret/#recommendatio
n for faster secret detection
2023-09-22T16:05:30.510+0900	FATAL	image scan error: scan error: unable to initialize a scanner: unable to initialize a docker scanner: 4 errors occurred:
	* unable to inspect the image (python:3.4-alpin): Error response from daemon: no such image: python:3.4-alpin: No such image: python:3.4-alpin
	* containerd socket not found: /run/containerd/containerd.sock
	* unable to initialize Podman client: no podman socket found: stat podman/podman.sock: no such file or directory
	* GET https://index.docker.io/v2/library/python/manifests/3.4-alpin: MANIFEST_UNKNOWN: manifest unknown; unknown tag=3.4-alpin


failed to parse json. err: invalid character 'F' looking for beginning of value
Perhaps scan has failed. Please check following scan results.
Result: Failed to new parser. err: Failed to parse JSON. Please use the latest version of trivy, trivy-to-vuls and future-vuls:
    github.com/future-architect/vuls/contrib/trivy/parser.NewParser
        /Users/wadahiroka/go/vuls/contrib/trivy/parser/parser.go:27

new errorlog

trivy image python:3.4-alpin -f json |./trivy-to-vuls parse --stdin | ./future-vuls upload --stdin --group-id 2603 --token fvgr-528ec289-2516-11ee-b1e6-0a58a9feac02 --uuid 506b2ede-ebf8-82da-f25f-43932a5d290
2023-09-22T16:35:30.177+0900	INFO	Vulnerability scanning is enabled
2023-09-22T16:35:30.177+0900	INFO	Secret scanning is enabled
2023-09-22T16:35:30.177+0900	INFO	If your scanning is slow, please try '--scanners vuln' to disable secret scanning
2023-09-22T16:35:30.177+0900	INFO	Please see also https://aquasecurity.github.io/trivy/v0.44/docs/scanner/secret/#recommendation for faster secret detection
2023-09-22T16:35:33.000+0900	FATAL	image scan error: scan error: unable to initialize a scanner: unable to initialize a docker scanner: 4 errors occurred:
	* unable to inspect the image (python:3.4-alpin): Error response from daemon: no such image: python:3.4-alpin: No such image: python:3.4-alpin
	* containerd socket not found: /run/containerd/containerd.sock
	* unable to initialize Podman client: no podman socket found: stat podman/podman.sock: no such file or directory
	* GET https://index.docker.io/v2/library/python/manifests/3.4-alpin: MANIFEST_UNKNOWN: manifest unknown; unknown tag=3.4-alpin


failed to parse json. err: invalid character 'F' looking for beginning of value
Perhaps scan has failed. Please check the scan results above or run trivy without pipes.

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

Reference

• https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/