cheyang

**What feature you'd like to add:** The default value of deleteSourceDataAfterMigration is false **Why is this feature needed:**

[DOC]configure clean cache policy for alluxioRuntime

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**Provide a link to that doc page:** **What is the defect and your suggestions on improvement:**

Place a security policy file SECURITY.md in the root directory of your repository. This makes it easily discoverable by a vulnerability reporter. The file should contain information on what constitutes...

Tracking issue for: - [ ] https://github.com/fluid-cloudnative/fluid/security/code-scanning/137 - [ ] https://github.com/fluid-cloudnative/fluid/security/code-scanning/142

**What feature you'd like to add:** https://docs.helm.sh/docs/topics/advanced/#storage-backends export HELM_DRIVER=configmap **Why is this feature needed:**

**What is your environment(Kubernetes version, Fluid version, etc.)** **Describe the bug** **What you expect to happen:** **How to reproduce it** **Additional Information**

**What is your environment(Kubernetes version, Fluid version, etc.)** **Describe the bug** Improve securityscorecards： https://api.securityscorecards.dev/projects/github.com/fluid-cloudnative/fluid **What you expect to happen:** **How to reproduce it** **Additional Information**

Origin/cherry pick fixes to 0.8.4 from master branch

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### Ⅰ. Describe what this PR does ### Ⅱ. Does this pull request fix one issue? fixes #XXXX ### Ⅲ. List the added test cases (unit test/integration test) if any,...

**What feature you'd like to add:** Add security info to the project. [(https://github.com/kubevela/kubevela/blob/master/SECURITY.md)](https://github.com/kubevela/kubevela/blob/master/SECURITY.md) **Why is this feature needed:**

Update default image name for alluxio runtime

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Signed-off-by: cheyang ### Ⅰ. Describe what this PR does ### Ⅱ. Does this pull request fix one issue? fixes #XXXX ### Ⅲ. List the added test cases (unit test/integration test)...