change 'main' to 'master'

.github/workflows/ghcr.yml

@@ -30,7 +30,7 @@ jobs:
               IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
               VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
               [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
-              [ "$VERSION" == "main" ] && VERSION=latest
+              [ "$VERSION" == "master" ] && VERSION=latest
               echo IMAGE_ID=$IMAGE_ID
               echo VERSION=$VERSION
               docker tag $IMAGE_NAME $IMAGE_ID:$VERSION