fix:add volumes that initcontainers used in sidecarset

[outgnaY]

Ⅰ. Describe what this PR does

fix: sidecarset doesn't insert volumes used in volumeMounts of initContainers

Ⅱ. Does this pull request fix one issue?

fixes #934

[kruise-bot]

Welcome @outgnaY! It looks like this is your first PR to openkruise/kruise 🎉

[codecov-commenter]

Codecov Report

Merging #929 (af3415e) into master (3f415af) will increase coverage by 0.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #929      +/-   ##
==========================================
+ Coverage   49.11%   49.46%   +0.34%     
==========================================
  Files         119      119              
  Lines       11163    11313     +150     
==========================================
+ Hits         5483     5596     +113     
- Misses       4833     4856      +23     
- Partials      847      861      +14     

Flag	Coverage Δ
unittests	49.46% <100.00%> (+0.34%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/webhook/pod/mutating/sidecarset.go	74.70% <100.00%> (+0.14%)	⬆️
pkg/util/containermeta/env_hash.go	44.82% <0.00%> (-9.34%)	⬇️
...chpriority/container_launch_priority_controller.go	33.70% <0.00%> (-2.17%)	⬇️
pkg/controller/cloneset/cloneset_event_handler.go	79.46% <0.00%> (-0.19%)	⬇️
pkg/controller/cloneset/sync/api.go	0.00% <0.00%> (ø)
pkg/controller/cloneset/utils/cloneset_utils.go	0.00% <0.00%> (ø)
pkg/util/inplaceupdate/inplace_update.go	34.35% <0.00%> (+0.81%)	⬆️
pkg/controller/cloneset/cloneset_controller.go	54.15% <0.00%> (+1.29%)	⬆️
pkg/controller/cloneset/sync/cloneset_update.go	48.24% <0.00%> (+1.75%)	⬆️
pkg/controller/cloneset/cloneset_status.go	89.18% <0.00%> (+5.40%)	⬆️
... and 1 more

---

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[Jeffwan]

The change looks good to me. Let's add some test cases similar like

kruise/pkg/webhook/pod/mutating/sidecarset_test.go

Line 609 in 2953c6c

func TestPodVolumeMountsAppend(t *testing.T) {

[FillZpp]

@outgnaY Thanks. The DCO failed. Please git commit --amend -s to signoff yourself and force push again.

[zmberg]

/lgtm

[FillZpp]

/lgtm

@outgnaY Thanks for working on this. Last comment - It seems the user name and email of your commit are not your github config (may be your private git config). Please first git config user.name "YOUR_GITHUB_NAME" and git config user.email "YOUR_GITHUB_EMAIL" in your local kruise repo and then force push again.

[FillZpp]

/lgtm

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp

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