store/sqlstore cleanup and postgres tests (#7595)

* sqlstore cleanup / postgres tests

* remove stopped containers

* cmd/platform compile fix

* remove test-postgres target from makefile

Makefile

@@ -343,22 +343,6 @@ ifeq ($(BUILD_ENTERPRISE_READY),true)
 	rm -f config/*.key
 endif
 
-test-postgres:
-	@echo Testing Postgres
-
-	@sed -i'' -e 's|"DriverName": "mysql"|"DriverName": "postgres"|g' config/config.json
-	@sed -i'' -e 's|"DataSource": "mmuser:mostest@tcp(dockerhost:3306)/mattermost_test?charset=utf8mb4,utf8"|"DataSource": "postgres://mmuser:mostest@dockerhost:5432?sslmode=disable"|g' config/config.json
-
-	$(GO) test $(GOFLAGS) -run=$(TESTS) -test.v -test.timeout=2000s -covermode=count -coverprofile=cprofile.out -coverpkg=$(ALL_PACKAGES_COMMA) github.com/mattermost/mattermost-server/store/sqlstore || exit 1; \
-	if [ -f cprofile.out ]; then \
-		tail -n +2 cprofile.out >> cover.out; \
-		rm cprofile.out; \
-	fi; \
-
-	@sed -i'' -e 's|"DataSource": "postgres://mmuser:mostest@dockerhost:5432?sslmode=disable"|"DataSource": "mmuser:mostest@tcp(dockerhost:3306)/mattermost_test?charset=utf8mb4,utf8"|g' config/config.json
-	@sed -i'' -e 's|"DriverName": "postgres"|"DriverName": "mysql"|g' config/config.json
-	@rm config/config.json-e
-
 test-server: test-te test-ee
 
 internal-test-web-client: