ci: Run sdk and api tests in ci

This adds new makefile targets and configuration to run the tests in the
api and sdk modules. These do not run by default since `go test ./...`
does not cross module boundaries.

Makefile

@@ -189,7 +189,6 @@ test-database-down:
 	make -C testing/dbtest/docker clean
 
 .PHONY: test-ci
-test-ci: install-go
 test-ci: export CI_BUILD=1
 test-ci:
 	CGO_ENABLED=$(CGO_ENABLED) BUILD_TAGS='$(BUILD_TAGS)' sh -c "'$(CURDIR)/scripts/build.sh'"
@@ -203,6 +202,17 @@ test-sql:
 test:
 	go test ./... -timeout 30m
 
+.PHONY: test-sdk
+test-sdk:
+	$(MAKE) -C sdk/ test
+
+.PHONY: test-api
+test-api:
+	$(MAKE) -C api/ test
+
+.PHONY: test-all
+test-all: test-sdk test-api test
+
 .PHONY: install-go
 install-go:
 	./ci/goinstall.sh