feat: Add support for openEuler OS.

[wjunLu]

Description

What's openEuler?

openEuler is an open source, free Linux distribution platform. The platform provides an open community for global developers to build an open, diversified, and architecture-inclusive software ecosystem. openEuler is also an innovative platform that
encourages everyone to propose new ideas, explore new approaches, and practice new solutions.

Learn more, please visit https://www.openeuler.org/en/

To support openEuler

Now, openEuler has 2,345,659 users, 18,072 contributors and 1,501 organization members(see https://datastat.openeuler.org/en/overview). It is necessary to support such a very mature open source operating system.

Discussion

Our discussion is here #6400

Related issues

• Support security scanning for openEuler Linux #6400

Related PRs

• [trivy-db ] (feat(openEuler): Add openEuler CVE database trivy-db#397)
• [vuln-list-update ] (feat(openEuler): Add module for updating openEuler os cves vuln-list-update#284)

Remove this section if you don't have related PRs.

Self-test

I have tested the function to scan openEuler CVEs, see the following log

~# ./trivy image openeuler-22.03-lts-sp3:latest -d             
2024-04-09T19:53:05.437+0800    DEBUG   Severities: ["UNKNOWN" "LOW" "MEDIUM" "HIGH" "CRITICAL"]
2024-04-09T19:53:05.438+0800    DEBUG   Ignore statuses {"statuses": null}
2024-04-09T19:53:05.476+0800    DEBUG   cache dir:  /Users/luweijun/Library/Caches/trivy
2024-04-09T19:53:05.477+0800    DEBUG   DB update was skipped because the local DB is the latest
2024-04-09T19:53:05.477+0800    DEBUG   DB Schema: 2, UpdatedAt: 2024-04-09 06:11:37.740307479 +0000 UTC, NextUpdate: 2024-04-09 12:11:37.740306928 +0000 UTC, DownloadedAt: 2024-04-09 06:19:11.548928 +0000 UTC
2024-04-09T19:53:05.483+0800    INFO    Vulnerability scanning is enabled
2024-04-09T19:53:05.483+0800    DEBUG   Vulnerability type:  [os library]
2024-04-09T19:53:05.483+0800    INFO    Secret scanning is enabled
2024-04-09T19:53:05.483+0800    INFO    If your scanning is slow, please try '--scanners vuln' to disable secret scanning
2024-04-09T19:53:05.483+0800    INFO    Please see also https://aquasecurity.github.io/trivy/dev/docs/scanner/secret/#recommendation for faster secret detection
2024-04-09T19:53:05.483+0800    DEBUG   Enabling misconfiguration scanners: [azure-arm cloudformation dockerfile helm kubernetes terraform terraformplan-json terraformplan-snapshot]
2024-04-09T19:53:05.626+0800    DEBUG   No secret config detected: trivy-secret.yaml
2024-04-09T19:53:05.628+0800    DEBUG   The nuget packages directory couldn't be found. License search disabled
2024-04-09T19:53:05.628+0800    DEBUG   No secret config detected: trivy-secret.yaml
2024-04-09T19:53:05.628+0800    DEBUG   Entering Inspect...
2024-04-09T19:53:05.628+0800    DEBUG   Image ID: sha256:1e1f6b42f136a4e5e2f5a8bd8c4036872da690fe4f626dc6b07617d2d08260a3
2024-04-09T19:53:05.628+0800    DEBUG   Diff IDs: [sha256:7e0958b5167da951982e27ec84f3ffa84bbab380dc71ce668fe9e305673ba44e]
2024-04-09T19:53:05.628+0800    DEBUG   Base Layers: []
2024-04-09T19:53:05.630+0800    DEBUG   Missing image ID in cache: sha256:1e1f6b42f136a4e5e2f5a8bd8c4036872da690fe4f626dc6b07617d2d08260a3
2024-04-09T19:53:05.630+0800    DEBUG   Running inspect...
2024-04-09T19:53:05.631+0800    DEBUG   Missing diff ID in cache: sha256:7e0958b5167da951982e27ec84f3ffa84bbab380dc71ce668fe9e305673ba44e
2024-04-09T19:53:13.793+0800    INFO    Family: openEuler, VersionID: 
2024-04-09T19:53:13.827+0800    INFO    Family: openEuler, VersionID: 22.03-LTS-SP3
2024-04-09T19:53:18.287+0800    INFO    License acquired from METADATA classifiers may be subject to additional terms for [gpg:1.16.0]
2024-04-09T19:53:18.288+0800    INFO    License acquired from METADATA classifiers may be subject to additional terms for [libcomps:0.1.19]
2024-04-09T19:53:18.380+0800    DEBUG   No secrets found in container image config
2024-04-09T19:53:18.454+0800    DEBUG   Finished inspect.
2024-04-09T19:53:18.457+0800    DEBUG   Exited from Inspect
2024-04-09T19:53:18.464+0800    INFO    Detected OS: openEuler
2024-04-09T19:53:18.466+0800    INFO    Detecting openEuler vulnerabilities [HERE]...
2024-04-09T19:53:18.466+0800    DEBUG   openEuler: os version: 22.03-LTS-SP3
2024-04-09T19:53:18.466+0800    DEBUG   openEuler: the number of packages: 137
2024-04-09T19:53:18.477+0800    INFO    Number of language-specific files: 1
2024-04-09T19:53:18.478+0800    INFO    Detecting python-pkg vulnerabilities...
2024-04-09T19:53:18.478+0800    DEBUG   Detecting library vulnerabilities, type: python-pkg, path: 

openeuler-22.03-lts-sp3:latest (openEuler 22.03-LTS-SP3)

Total: 13 (UNKNOWN: 0, LOW: 6, MEDIUM: 4, HIGH: 3, CRITICAL: 0)

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).