Update check-unique-tags.yml

Signed-off-by: John Osborne <josborne@chainguard.dev>

.github/workflows/check-unique-tags.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Get latest unique tag
         id: get_current_unique_tag
         run: |
-          LATEST_UNIQUE_TAG=$(crane ls ${{ env.REDIS_IMAGE }} | grep -E '^[^ ]+-[0-9]{12}$' | grep -v '^latest' | sort -Vr | head -n 1)
+          LATEST_UNIQUE_TAG=$(crane ls ${{ env.REDIS_IMAGE }} | grep -E '^[^ ]+-[0-9]{12}$' | grep -v '^latest' | grep -v '\-dev' | sort -Vr | head -n 1)
           echo "LATEST_UNIQUE_TAG=${LATEST_UNIQUE_TAG}" >> $GITHUB_ENV
 
       - name: Compare unique tags