Log into DockerHub prior to running CI builds

Closes gh-24038

ci/scripts/common.sh

@@ -5,4 +5,8 @@ if [[ -d $PWD/embedmongo && ! -d $HOME/.embedmongo ]]; then
 	ln -s "$PWD/embedmongo" "$HOME/.embedmongo"
 fi
 
+if [[ -n $DOCKER_HUB_USERNAME ]]; then
+	docker login -u $DOCKER_HUB_USERNAME -p $DOCKER_HUB_PASSWORD
+fi
+
 cleanup_maven_repo "org.springframework.boot"