diff --git a/.gitea/workflows/pr-check.yml b/.gitea/workflows/pr-check.yml
index 332ef34..c2892cc 100644
--- a/.gitea/workflows/pr-check.yml
+++ b/.gitea/workflows/pr-check.yml
@@ -68,18 +68,20 @@ jobs:
 
       - name: Build Docker image
         run: |
+          IMG_NAME=$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')
           if [[ -f Dockerfile ]]; then
-            docker build -t $GITHUB_REPOSITORY:pr-${GITHUB_RUN_ID} .
-            echo "Docker build successful: $GITHUB_REPOSITORY:pr-${GITHUB_RUN_ID}"
+            docker build -t ${IMG_NAME}:pr-${GITHUB_RUN_ID} .
+            echo "Docker build successful: ${IMG_NAME}:pr-${GITHUB_RUN_ID}"
           else
             echo "No Dockerfile found, skipping"
           fi
 
       - name: Test container startup
         run: |
+          IMG_NAME=$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')
           if [[ -f Dockerfile ]]; then
             docker run --rm --name pr-test-$GITHUB_RUN_ID \
-              $GITHUB_REPOSITORY:pr-${GITHUB_RUN_ID} \
+              ${IMG_NAME}:pr-${GITHUB_RUN_ID} \
               true || echo "Container startup test skipped"
           fi