[ci] Use k8s runner for ci.

[jolestar]

No description provided.

[codecov]

Codecov Report

Merging #1897 (d9da236) into master (1fc7a6b) will decrease coverage by 0.09%.
The diff coverage is 14.98%.

@@            Coverage Diff             @@
##           master    #1897      +/-   ##
==========================================
- Coverage   29.67%   29.58%   -0.10%     
==========================================
  Files         431      432       +1     
  Lines       43815    44064     +249     
  Branches    20210    20312     +102     
==========================================
+ Hits        13004    13035      +31     
- Misses      17191    17413     +222     
+ Partials    13620    13616       -4     

Flag	Coverage Δ
unittests	29.58% <14.98%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
account/api/src/types.rs	56.52% <0.00%> (+8.40%)	⬆️
account/lib/src/account.rs	37.03% <0.00%> (ø)
chain/src/tests/test_block_chain.rs	12.45% <0.00%> (ø)
chain/src/tests/test_opened_block.rs	17.64% <0.00%> (ø)
cmd/indexer/src/es_sinker.rs	0.00% <ø> (ø)
cmd/starcoin/src/dev/sign_txn_helper.rs	15.98% <0.00%> (ø)
executor/src/account.rs	43.90% <0.00%> (ø)
miner/src/create_block_template/mod.rs	41.83% <0.00%> (ø)
rpc/api/src/account/mod.rs	29.41% <ø> (-3.93%)	⬇️
rpc/api/src/contract_api.rs	16.66% <0.00%> (-3.34%)	⬇️
... and 47 more

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