Problem: sim test fails without objstore build tag (#1540)

Solution:
- set build tags in environment variable

Makefile

@@ -166,26 +166,31 @@ test-sim-random-genesis-fast:
 	@go test -tags=objstore -mod=readonly $(SIMAPP) -run TestFullAppSimulation \
 		-Enabled=true -NumBlocks=100 -BlockSize=200 -Commit=true -Seed=99 -Period=5 -v -timeout 24h
 
+test-sim-import-export: export GOFLAGS=-tags=objstore
 test-sim-import-export: runsim
 	@echo "Running application import/export simulation. This may take several minutes..."
-	@$(BINDIR)/runsim -Tags=objstore -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 5 TestAppImportExport
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 5 TestAppImportExport
 
+test-sim-after-import: export GOFLAGS=-tags=objstore
 test-sim-after-import: runsim
 	@echo "Running application simulation-after-import. This may take several minutes..."
-	@$(BINDIR)/runsim -Tags=objstore -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 5 TestAppSimulationAfterImport
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 5 TestAppSimulationAfterImport
 
+test-sim-custom-genesis-multi-seed: export GOFLAGS=-tags=objstore
 test-sim-custom-genesis-multi-seed: runsim
 	@echo "Running multi-seed custom genesis simulation..."
 	@echo "By default, ${HOME}/.cronosd/config/genesis.json will be used."
-	@$(BINDIR)/runsim -Tags=objstore -Genesis=${HOME}/.cronosd/config/genesis.json -SimAppPkg=$(SIMAPP) -ExitOnFail 400 5 TestFullAppSimulation
+	@$(BINDIR)/runsim -Genesis=${HOME}/.cronosd/config/genesis.json -SimAppPkg=$(SIMAPP) -ExitOnFail 400 5 TestFullAppSimulation
 
+test-sim-multi-seed-long: export GOFLAGS=-tags=objstore
 test-sim-multi-seed-long: runsim
 	@echo "Running long multi-seed application simulation. This may take awhile!"
-	@$(BINDIR)/runsim -Tags=objstore -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 500 50 TestFullAppSimulation
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 500 50 TestFullAppSimulation
 
+test-sim-multi-seed-short: export GOFLAGS=-tags=objstore
 test-sim-multi-seed-short: runsim
 	@echo "Running short multi-seed application simulation. This may take awhile!"
-	@$(BINDIR)/runsim -Tags=objstore -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 10 TestFullAppSimulation
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) -ExitOnFail 50 10 TestFullAppSimulation
 
 test-sim-benchmark-invariants:
 	@echo "Running simulation invariant benchmarks..."