diff --git a/.gitea/limbo_actions/buildkit-build-push/action.yaml b/.gitea/limbo_actions/buildkit-build-push/action.yaml
index 171a69c..feab711 100644
--- a/.gitea/limbo_actions/buildkit-build-push/action.yaml
+++ b/.gitea/limbo_actions/buildkit-build-push/action.yaml
@@ -35,13 +35,32 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - name: run buildctl build and push
+      shell: bash
+      run: |
     - name: run buildctl build and push
       shell: bash
       run: |
 
-        AUTH=$(printf '{"username":"%s","password":"%s"}' \
-          "${{ inputs.registry_username }}" \
-          "${{ inputs.registry_password }}" | base64 -w0)
+        # create docker config temp folder
+        DOCKER_CONFIG_DIR="${RUNNER_TEMP}/.buildctl_docker"
+        mkdir -p "$DOCKER_CONFIG_DIR"
+
+        # clean up
+        trap 'rm -rf "$DOCKER_CONFIG_DIR"' EXIT
+
+        # setup file docker config (auth) temp file
+        AUTH=$(printf "%s" "${{ inputs.registry_username }}:${{ inputs.registry_password }}" | base64 -w 0)
+        
+        cat > "$DOCKER_CONFIG_DIR/config.json" <<EOF
+        {
+          "auths": {
+            "${{ inputs.registry_addr }}": {
+              "auth": "$AUTH"
+            }
+          }
+        }
+        EOF
 
         # Build build-arg flags
         BUILD_ARG_FLAGS=""
@@ -52,7 +71,7 @@ runs:
 
         echo "Using build args: $BUILD_ARG_FLAGS"
 
-        buildctl \
+        DOCKER_CONFIG=$DOCKER_CONFIG_DIR buildctl \
           --addr ${{ inputs.buildkit_addr }} \
           build \
           --frontend=dockerfile.v0 \