fix bigfoot docker

.gitea/workflows/ci.yaml

@@ -74,6 +74,9 @@ jobs:
     needs: build-base-builder
 
     steps:
+      - name: Set BRANCH_NAME
+        run: echo "BRANCH_NAME=$(echo $GITHUB_REF_NAME | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       - name: Checkout
         uses: actions/checkout@v6
 
@@ -100,4 +103,4 @@ jobs:
             CONAN_RELEASE_PROFILE=clang
             CONAN_RELWITHDEBINFO_PROFILE=clangd
             CONAN_DEBUG_PROFILE=clangd
-            PACKAGES_CHANNEL=${{ github.ref_name }}
+            PACKAGES_CHANNEL=${{ env.BRANCH_NAME }}