fixed build nameing, v6

.gitea/workflows/build-appimage.yaml

@@ -19,7 +19,7 @@ jobs:
       - name: Declare some variables
         shell: bash
         run: |
-          echo "SHA_SHORT=${GITEA_SHA:7}" >> "$GITEA_ENV"
+          echo "SHA_SHORT=$(git rev-parse --short HEAD)" >> "$GITEA_ENV"
           echo "YEAR=$(python3 -c \"import datetime;print(datetime.date.today().year)\")" >> "$GITEA_ENV"
       - name: Build AppImage
         run: |