feat(develop): rc6 release (labring#738)

use new const for kubeletconfig (labring#589)

Signed-off-by: oldthreefeng <[email protected]>

fix calico version nil yaml file retrun null. (labring#658)

Signed-off-by: oldthreefeng <[email protected]>

Merge pull request labring#619 from oldthreefeng/develop

fix decode miss cakey

Merge pull request labring#616 from oldthreefeng/develop

fix decode cmd miss TokenCaCertHash

Update release.yml

fix arm64 tags

Merge pull request labring#609 from oldthreefeng/prefight_contianerd

add prefight when version >= 1.20.

Merge pull request labring#592 from oldthreefeng/requirement

Requirements and Recommendations for labring#591

Merge pull request labring#588 from oldthreefeng/develop

use channel to manage goroutine when upgrade nodes

Merge pull request labring#578 from oldthreefeng/fix_join_node

 join node use config file