Build tooling enhancements (#10429)

* Add LDFLAGS variable

* Replace curl by wget

* Revert "Replace curl by wget"

This reverts commit f40323c3d2e693f74a4a3f8705ab011feb3e378a.

* Use curl instead of wget

* Merge GO_LINKER_FLAGS into LDFLAGS

Makefile

@@ -48,12 +48,11 @@ GOPATH ?= $(shell go env GOPATH)
 GOFLAGS ?= $(GOFLAGS:)
 GO=go
 DELVE=dlv
-GO_LINKER_FLAGS ?= -ldflags \
-				   "-X github.com/mattermost/mattermost-server/model.BuildNumber=$(BUILD_NUMBER)\
-				    -X 'github.com/mattermost/mattermost-server/model.BuildDate=$(BUILD_DATE)'\
-				    -X github.com/mattermost/mattermost-server/model.BuildHash=$(BUILD_HASH)\
-				    -X github.com/mattermost/mattermost-server/model.BuildHashEnterprise=$(BUILD_HASH_ENTERPRISE)\
-				    -X github.com/mattermost/mattermost-server/model.BuildEnterpriseReady=$(BUILD_ENTERPRISE_READY)"
+LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildNumber=$(BUILD_NUMBER)"
+LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildDate=$(BUILD_DATE)"
+LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildHash=$(BUILD_HASH)"
+LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildHashEnterprise=$(BUILD_HASH_ENTERPRISE)"
+LDFLAGS += -X "github.com/mattermost/mattermost-server/model.BuildEnterpriseReady=$(BUILD_ENTERPRISE_READY)"
 
 # GOOS/GOARCH of the build host, used to determine whether we're cross-compiling or not
 BUILDER_GOOS_GOARCH="$(shell $(GO) env GOOS)_$(shell $(GO) env GOARCH)"
@@ -429,7 +428,7 @@ cover: ## Runs the golang coverage tool. You must run the unit tests first.
 	$(GO) tool cover -html=ecover.out
 
 test-data: start-docker ## Add test data to the local instance.
-	$(GO) run $(GOFLAGS) $(GO_LINKER_FLAGS) $(PLATFORM_FILES) sampledata -w 1
+	$(GO) run $(GOFLAGS) -ldflags '$(LDFLAGS)' $(PLATFORM_FILES) sampledata -w 1
 
 	@echo You may need to restart the Mattermost server before using the following
 	@echo ========================================================================
@@ -441,8 +440,8 @@ run-server: start-docker ## Starts the server.
 	@echo Running mattermost for development
 
 	mkdir -p $(BUILD_WEBAPP_DIR)/dist/files
-	$(GO) run $(GOFLAGS) $(GO_LINKER_FLAGS) $(PLATFORM_FILES) --disableconfigwatch | \
-	    $(GO) run $(GOFLAGS) $(GO_LINKER_FLAGS) $(PLATFORM_FILES) logs --logrus &
+	$(GO) run $(GOFLAGS) -ldflags '$(LDFLAGS)' $(PLATFORM_FILES) --disableconfigwatch | \
+	    $(GO) run $(GOFLAGS) -ldflags '$(LDFLAGS)' $(PLATFORM_FILES) logs --logrus &
 
 debug-server: start-docker
 	mkdir -p $(BUILD_WEBAPP_DIR)/dist/files
@@ -457,7 +456,7 @@ run-cli: start-docker ## Runs CLI.
 	@echo Running mattermost for development
 	@echo Example should be like 'make ARGS="-version" run-cli'
 
-	$(GO) run $(GOFLAGS) $(GO_LINKER_FLAGS) $(PLATFORM_FILES) ${ARGS}
+	$(GO) run $(GOFLAGS) -ldflags '$(LDFLAGS)' $(PLATFORM_FILES) ${ARGS}
 
 run-client: ## Runs the webapp.
 	@echo Running mattermost client for development
@@ -506,7 +505,7 @@ restart-client: | stop-client run-client ## Restarts the webapp.
 
 run-job-server: ## Runs the background job server.
 	@echo Running job server for development
-	$(GO) run $(GOFLAGS) $(GO_LINKER_FLAGS) $(PLATFORM_FILES) jobserver --disableconfigwatch &
+	$(GO) run $(GOFLAGS) -ldflags '$(LDFLAGS)' $(PLATFORM_FILES) jobserver --disableconfigwatch &
 
 config-ldap: ## Configures LDAP.
 	@echo Setting up configuration for local LDAP