diff --git a/tasks/docker-registry/task.yaml b/tasks/docker-registry/task.yaml
index 10fabe0..de5d205 100644
--- a/tasks/docker-registry/task.yaml
+++ b/tasks/docker-registry/task.yaml
@@ -40,16 +40,19 @@ spec:
 
   steps:
     - name: build-and-push
-      image: bash:5
+      image: alpine:3.21.3
       workingDir: /workspace/source
       env:
         - name: DOCKER_CONFIG
           value: /tekton/home/.docker
       script: |
-        #!/usr/bin/env bash
-        set -euo pipefail
+        #!/bin/sh
+        set -e
 
-        if [[ -n "$(params.subdirectory)" ]]; then
+        echo "📦 Installing curl and tar..."
+        apk add --no-cache curl tar
+
+        if [ -n "$(params.subdirectory)" ]; then
           cd "$(params.subdirectory)"
         fi
 
@@ -59,7 +62,7 @@ spec:
 
         USERNAME=$(cat /workspace/docker-auth/username)
         PASSWORD=$(cat /workspace/docker-auth/password)
-        REGISTRY=$(cut -d/ -f1 <<< "$IMAGE")
+        REGISTRY=$(echo "$IMAGE" | cut -d/ -f1)
 
         echo "🔐 Writing Docker config for $REGISTRY..."
         mkdir -p "$DOCKER_CONFIG"