Pin crate docker image for testing

Makefile

@@ -88,7 +88,7 @@ docker-run:
 		-d cobaugh/openldap-alpine
 	docker run --name cratedb \
 		-p "6543:5432" \
-		-d crate crate \
+		-d crate:2.2 \
 		-Cnetwork.host=0.0.0.0 \
 		-Ctransport.host=localhost \
 		-Clicense.enterprise=false
@@ -116,12 +116,6 @@ docker-run-circle:
 		-e SLAPD_CONFIG_ROOTPW="secret" \
 		-p "389:389" -p "636:636" \
 		-d cobaugh/openldap-alpine
-	docker run --name cratedb \
-		-p "6543:5432" \
-		-d crate crate \
-		-Cnetwork.host=0.0.0.0 \
-		-Ctransport.host=localhost \
-		-Clicense.enterprise=false
 
 docker-kill:
 	-docker kill aerospike elasticsearch kafka memcached mqtt mysql nats nsq \