Fix template to add placeholder for lang instead of cpp

Author: xcorail

templates/action/image/publish.sh

@@ -6,8 +6,8 @@ set -x
 docker login docker.pkg.github.com -u github-actions -p ${GITHUB_TOKEN}
 
 IMAGE_VERSION=0.0.1
-IMAGE_TAG=docker.pkg.github.com/github/codeql-learninglab-actions/courses-cpp-<course-name>:${IMAGE_VERSION}
-IMAGE_LATEST_TAG=docker.pkg.github.com/github/codeql-learninglab-actions/courses-cpp-<course-name>:latest
+IMAGE_TAG=docker.pkg.github.com/github/codeql-learninglab-actions/courses-<lang>-<course-name>:${IMAGE_VERSION}
+IMAGE_LATEST_TAG=docker.pkg.github.com/github/codeql-learninglab-actions/courses-<lang>-<course-name>:latest
 
 docker build -t $IMAGE_TAG -t $IMAGE_LATEST_TAG .