diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7170fad..935e2c1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,7 +18,9 @@ jobs:
     name: Test Node
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with Node.js (npm)
         uses: ./
@@ -48,7 +50,9 @@ jobs:
     name: Test PHP
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with PHP
         uses: ./
@@ -81,10 +85,10 @@ jobs:
     services:
       mongo:
         image: mongo:7
-        ports:
-          - 27017:27017
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: Test action with database configuration
         uses: ./
@@ -126,10 +130,10 @@ jobs:
     services:
       mongo:
         image: mongo:7
-        ports:
-          - 27017:27017
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: Test action with base modules
         uses: ./
@@ -167,7 +171,9 @@ jobs:
     name: Test Base Modules Requires PHP
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: Expect failure when install-base-modules is set without install-php
         id: expect-failure
@@ -194,7 +200,9 @@ jobs:
     name: Test nginx
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with nginx
         uses: ./
@@ -220,7 +228,9 @@ jobs:
     name: Test All Components
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with all components
         uses: ./
@@ -262,7 +272,9 @@ jobs:
     name: Test Custom Server Path
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with custom path
         uses: ./
@@ -293,7 +305,9 @@ jobs:
     name: Test Build Command
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       
       - name: Test action with build command
         uses: ./
@@ -309,4 +323,6 @@ jobs:
       - name: Verify build
         run: |
           cd ./test-server
-          npm run dev
+          test -f build.log
+          grep -q '^Build complete$' build.log
+          echo "✓ Custom build command completed successfully"
diff --git a/action.yml b/action.yml
index 3a3d9b8..5d914c2 100644
--- a/action.yml
+++ b/action.yml
@@ -156,6 +156,7 @@ runs:
         fetch-depth: 1
         submodules: recursive
         github-server-url: ${{ inputs.github-server-url }}
+        persist-credentials: false
 
     - name: Checkout server repository (with token)
       if: inputs.checkout-token != ''
@@ -168,6 +169,7 @@ runs:
         submodules: recursive
         github-server-url: ${{ inputs.github-server-url }}
         token: ${{ inputs.checkout-token }}
+        persist-credentials: false
 
     - name: Setup Node
       if: inputs.install-node == 'true'