use artifact id instead of name for docker build

Author: binarycodes

.github/workflows/ssh-key-signer-server-docker.yml

@@ -30,7 +30,7 @@ jobs:
       - name: extract project version
         id: extract_version
         run: |
-          echo "MAVEN_NAME=$(mvn -q -Dexec.executable='echo' -Dexec.args='${project.name}' --non-recursive exec:exec)" >> $GITHUB_OUTPUT
+          echo "MAVEN_NAME=$(mvn -q -Dexec.executable='echo' -Dexec.args='${project.artifactId}' --non-recursive exec:exec)" >> $GITHUB_OUTPUT
           echo "MAVEN_VERSION=$(mvn -q -Dexec.executable='echo' -Dexec.args='${project.version}' --non-recursive exec:exec)" >> $GITHUB_OUTPUT
 
       - name: login to docker hub