fix: add initContainers to verify if apisix is ready

[gxthrj]

Please answer these questions before submitting a pull request

• Why submit this pull request?
• Bugfix
• New feature provided
• Improve performance
• Backport patches

[codecov-commenter]

Codecov Report

Merging #660 (4daccce) into master (75a2aaa) will increase coverage by 0.04%.
The diff coverage is 45.83%.

❗ Current head 4daccce differs from pull request most recent head da4598d. Consider uploading reports for the commit da4598d to get more accurate results

@@            Coverage Diff             @@
##           master     #660      +/-   ##
==========================================
+ Coverage   34.72%   34.77%   +0.04%     
==========================================
  Files          60       60              
  Lines        5892     5916      +24     
==========================================
+ Hits         2046     2057      +11     
- Misses       3596     3608      +12     
- Partials      250      251       +1     

Impacted Files	Coverage Δ
pkg/apisix/apisix.go	67.50% <ø> (ø)
pkg/apisix/nonexistentclient.go	42.42% <0.00%> (-2.03%)	⬇️
pkg/kube/translation/apisix_route.go	26.57% <41.66%> (+0.41%)	⬆️
pkg/apisix/schema.go	63.26% <100.00%> (+5.12%)	⬆️

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[tokers]

Please don't forget to modify helm chart.

[tao12345666333]

Let's go forward