PMM-12494 Wait for PMM to be ready (#640)

* Update docker_way_upgrade.sh

* Update docker_way_upgrade.sh

* Update docker_way_upgrade.sh

Author: BupycHuk

pmm-tests/docker_way_upgrade.sh

@@ -6,6 +6,20 @@ if [ $# -lt 1 ]; then
     exit 1
 fi
 
+wait-for-url() {
+    echo "Testing $1"
+    timeout -s TERM 240 bash -c \
+    'while [[ "$(curl -s -o /dev/null -L -w ''%{http_code}'' ${0})" != "200" ]];\
+    do echo "Waiting for ${0}" && sleep 2;\
+    done' ${1}
+    echo "OK!"
+    if curl -I $1; then
+        echo "PMM is ready"
+    else
+        echo "PMM is not ready"
+    fi
+}
+
 #check for Container Name To Stop before Upgrade
 export PMM_SERVER_DOCKER_CONTAINER=$(docker ps --format "table {{.ID}}\t{{.Image}}\t{{.Names}}" | grep 'pmm-server' | awk '{print $3}')
 echo $PMM_SERVER_DOCKER_CONTAINER
@@ -17,5 +31,5 @@ export PMM_SERVER_DOCKER_VOLUME=$(docker ps -a --format "table {{.ID}}\t{{.Image
 
 PWD=$(pwd) PMM_SERVER_IMAGE=$1 docker-compose up -d pmm-server
 docker network connect pmm-qa pmm-server || true
-sleep 30
+wait-for-url http://127.0.0.1/v1/readyz
 docker logs pmm-server