feat(openEuler): Add openEuler CVE database

[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/

Trivy does not support openEuler

We can see that the operating systems currently supported by trivy for security detection does not include openEuler(see https://aquasecurity.github.io/trivy/v0.50/docs/coverage/os/).

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 aquasecurity/trivy#6400

Relatived PRs

aquasecurity/vuln-list-update#284

[CLAassistant]

All committers have signed the CLA.

[wjunLu]

The testing result follows:

=== RUN   TestVulnSrc_Update
=== RUN   TestVulnSrc_Update/happy_path_with_openEuler
2024/05/17 17:07:02 Saving openEuler CVRF
=== RUN   TestVulnSrc_Update/sad_path_(dir_doesn't_exist)
2024/05/17 17:07:02 Saving openEuler CVRF
=== RUN   TestVulnSrc_Update/sad_path_(failed_to_decode)
2024/05/17 17:07:02 Saving openEuler CVRF
--- PASS: TestVulnSrc_Update (0.19s)
    --- PASS: TestVulnSrc_Update/happy_path_with_openEuler (0.12s)
    --- PASS: TestVulnSrc_Update/sad_path_(dir_doesn't_exist) (0.02s)
    --- PASS: TestVulnSrc_Update/sad_path_(failed_to_decode) (0.04s)
=== RUN   TestVulnSrc_Get
=== RUN   TestVulnSrc_Get/happy_path_1
=== RUN   TestVulnSrc_Get/happy_path_2
=== RUN   TestVulnSrc_Get/no_advisories_are_returned
=== RUN   TestVulnSrc_Get/GetAdvisories_returns_an_error
--- PASS: TestVulnSrc_Get (0.36s)
    --- PASS: TestVulnSrc_Get/happy_path_1 (0.09s)
    --- PASS: TestVulnSrc_Get/happy_path_2 (0.09s)
    --- PASS: TestVulnSrc_Get/no_advisories_are_returned (0.09s)
    --- PASS: TestVulnSrc_Get/GetAdvisories_returns_an_error (0.09s)
=== RUN   TestSeverityFromThreat
--- PASS: TestSeverityFromThreat (0.00s)
=== RUN   TestGetOSVersion
=== RUN   TestGetOSVersion/cpe:/a:openEuler:openEuler:22.03-LTS-SP2
=== RUN   TestGetOSVersion/cpe:/a:openEuler:openEuler:20.03-LTS
=== RUN   TestGetOSVersion/cpe:/a:openEuler:openEuler:21.03
=== RUN   TestGetOSVersion/cpe:/a:openEuler:openEuler:20.03-LTS-LTS-SP4
2024/05/17 17:07:02 invalid openEuler version: 20.03-LTS-LTS-SP4
=== RUN   TestGetOSVersion/cpe:/a:openEuler:23.09
--- PASS: TestGetOSVersion (0.00s)
    --- PASS: TestGetOSVersion/cpe:/a:openEuler:openEuler:22.03-LTS-SP2 (0.00s)
    --- PASS: TestGetOSVersion/cpe:/a:openEuler:openEuler:20.03-LTS (0.00s)
    --- PASS: TestGetOSVersion/cpe:/a:openEuler:openEuler:21.03 (0.00s)
    --- PASS: TestGetOSVersion/cpe:/a:openEuler:openEuler:20.03-LTS-LTS-SP4 (0.00s)
    --- PASS: TestGetOSVersion/cpe:/a:openEuler:23.09 (0.00s)
PASS
ok      github.com/aquasecurity/trivy-db/pkg/vulnsrc/openeuler

[julien-faye]

+1 to add support for openEuler OS!
It is a great alternative for CentOS!

[wjunLu]

Could someone run tests for this PR? Thanks!