build badgerdb using jemalloc

[ptrus]

TODO:

• install jemalloc in release workflow
  • tested release-dev workflow, for build binary, see the artifacts here: https://github.com/oasisprotocol/oasis-core/runs/2841426938
  • ci run: https://buildkite.com/oasisprotocol/oasis-core-ci/builds/5277
• update build instructions documentation (optionally install jemalloc, or use export OASIS_BADGER_NO_JEMALLOC=1)

[codecov]

Codecov Report

Merging #4040 (b591791) into master (42301db) will decrease coverage by 0.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4040      +/-   ##
==========================================
- Coverage   67.09%   66.42%   -0.68%     
==========================================
  Files         410      410              
  Lines       42157    42157              
==========================================
- Hits        28285    28001     -284     
- Misses       9893    10184     +291     
+ Partials     3979     3972       -7     

Impacted Files	Coverage Δ
go/oasis-node/cmd/ias/auth_registry.go	0.00% <0.00%> (-67.13%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	0.00% <0.00%> (-52.95%)	⬇️
go/ias/http/http.go	18.51% <0.00%> (-44.45%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.38% <0.00%> (-19.24%)	⬇️
go/keymanager/api/policy_sgx.go	23.07% <0.00%> (-15.39%)	⬇️
go/storage/api/context.go	86.36% <0.00%> (-13.64%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	78.94% <0.00%> (-10.53%)	⬇️
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
go/storage/api/root_cache.go	75.55% <0.00%> (-8.89%)	⬇️
go/common/sgx/aesm/aesm.go	62.61% <0.00%> (-8.42%)	⬇️
... and 42 more

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