fix: Use single quotes for Maven property in workflow

Backslash escaping passed the literal string '${project.version}' to
Maven, which failed because it's not a valid Docker tag. Single quotes
prevent bash variable expansion while allowing Maven to resolve the
property.

Author: johngrimes

.github/workflows/server-pre-release.yml

@@ -50,7 +50,7 @@ jobs:
           DOCKER_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
         run: |
           mvn --batch-mode deploy -Pdocker -Dmaven.deploy.skip \
-          -Djib.to.tags=\${project.version} \
+          '-Djib.to.tags=${project.version}' \
           org.sonarsource.scanner.maven:sonar-maven-plugin:sonar \
           -Dsonar.projectKey=aehrc_pathling -Dsonar.organization=aehrc \
           -Dsonar.host.url=https://sonarcloud.io \