fix: persist cache upload settings

.gitea/actions/rust-cache/action.yml

@@ -44,11 +44,15 @@ runs:
         echo "key=${{ inputs.cache-prefix }}-${{ inputs.cache-version }}-$OS-$ARCH-${{ inputs.toolchain }}-$HASH" >> $GITHUB_OUTPUT
         echo "restore-prefix=${{ inputs.cache-prefix }}-${{ inputs.cache-version }}-$OS-$ARCH-${{ inputs.toolchain }}-" >> $GITHUB_OUTPUT
 
+    - name: Configure cache upload
+      shell: bash
+      run: |
+        echo "CACHE_UPLOAD_CONCURRENCY=1" >> "$GITHUB_ENV"
+
     - name: Restore Rust cache
       id: cache-restore
       env:
         ACTIONS_CACHE_SERVICE_V2: "0"
-        CACHE_UPLOAD_CONCURRENCY: "1"
       uses: https://gitea.com/actions/cache@v3
       with:
         path: |