diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..08b23e1
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,11 @@
+FROM alpine:3.21
+
+RUN apk add --no-cache bash curl jq
+
+COPY cleanup-releases.sh /cleanup-releases.sh
+COPY cleanup-images.sh /cleanup-images.sh
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chmod +x /cleanup-releases.sh /cleanup-images.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
diff --git a/action.yml b/action.yml
index 2cb25cf..9aa3f1b 100644
--- a/action.yml
+++ b/action.yml
@@ -23,30 +23,5 @@ inputs:
     required: false
     default: 'false'
 runs:
-  using: 'composite'
-  steps:
-    - name: 清理舊版本
-      id: cleanup
-      shell: bash
-      run: |
-        chmod +x "${{ github.action_path }}/cleanup-releases.sh"
-        "${{ github.action_path }}/cleanup-releases.sh" \
-          "${{ inputs.gitea-server }}" \
-          "${{ inputs.repository }}" \
-          "${{ inputs.token }}" \
-          "${{ inputs.keep-count }}" \
-          "${{ inputs.dry-run }}"
-    
-    - name: 清理舊映像
-      id: cleanup-images
-      if: inputs.package-name != ''
-      shell: bash
-      run: |
-        chmod +x "${{ github.action_path }}/cleanup-images.sh"
-        "${{ github.action_path }}/cleanup-images.sh" \
-          "${{ inputs.gitea-server }}" \
-          "${{ inputs.repository }}" \
-          "${{ inputs.package-name }}" \
-          "${{ inputs.token }}" \
-          "${{ inputs.keep-count }}" \
-          "${{ inputs.dry-run }}"
+  using: 'docker'
+  image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..c781874
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+GITEA_SERVER="${INPUT_GITEA_SERVER}"
+REPOSITORY="${INPUT_REPOSITORY}"
+PACKAGE_NAME="${INPUT_PACKAGE_NAME:-}"
+TOKEN="${INPUT_TOKEN}"
+KEEP_COUNT="${INPUT_KEEP_COUNT:-2}"
+DRY_RUN="${INPUT_DRY_RUN:-false}"
+
+/cleanup-releases.sh "$GITEA_SERVER" "$REPOSITORY" "$TOKEN" "$KEEP_COUNT" "$DRY_RUN"
+
+if [[ -n "$PACKAGE_NAME" ]]; then
+  /cleanup-images.sh "$GITEA_SERVER" "$REPOSITORY" "$PACKAGE_NAME" "$TOKEN" "$KEEP_COUNT" "$DRY_RUN"
+fi