Always use the latest tag

In the past we would search for the last pushed which would with
semantic versioning be the same, this makes more sense IMHO.

Author: vmcj

.github/workflows/build-domjudge-container-PR.yml

@@ -49,7 +49,7 @@ jobs:
           sudo apt update; sudo apt install -y jq curl
           set -x
             HUBURL="https://registry.hub.docker.com/v2/repositories/domjudge/domserver/tags"
-            TAG=$(curl $HUBURL|jq '.results | sort_by(.name) | .[length-2].name')
+            TAG=$(curl $HUBURL|jq '.results | sort_by(.name) | last.name')
             DJ_TAG=${TAG//\"}
           set +x
           echo "DOMJUDGE_VERSION=$DJ_TAG" >> $GITHUB_ENV

.github/workflows/build-domjudge-container-release.yml

@@ -41,7 +41,7 @@ jobs:
           sudo apt update; sudo apt install jq curl -y
           set -x
             HUBURL="https://registry.hub.docker.com/v2/repositories/domjudge/domserver/tags"
-            TAG=$(curl $HUBURL|jq '.results | sort_by(.name) | .[length-2].name')
+            TAG=$(curl $HUBURL|jq '.results | sort_by(.name) | last.name')
             DJ_TAG=${TAG//\"}
           set +x
           echo "DOMJUDGE_VERSION=$DJ_TAG" >> $GITHUB_ENV