diff --git a/.github/workflows/build.yaml b/.github/workflows/build-and-push.yaml
similarity index 85%
rename from .github/workflows/build.yaml
rename to .github/workflows/build-and-push.yaml
index 7093442..c65958f 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build-and-push.yaml
@@ -1,4 +1,4 @@
-name: Build and Push Docker Image
+name: Build and Push
 
 on:
   push:
@@ -7,19 +7,18 @@ on:
       - main
     tags:
       - '*.*.*.*-*'  # Format: 1.27.1.2-0
-  pull_request:
-    branches:
-      - master
-      - main
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ !startsWith(github.ref, 'refs/tags/') }}
+
 env:
   DOCKER_IMAGE: intimatemerger/openresty
 
 jobs:
   build:
     name: Build ${{ matrix.platform }}
-    if: github.event_name != 'pull_request'
     runs-on: ${{ matrix.runner }}
     permissions:
       contents: read
@@ -46,7 +45,7 @@ jobs:
         uses: docker/login-action@v3
         with:
           username: ${{ vars.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_PUSH_TOKEN }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_PUBLIC }}
 
       - name: Build and push by digest
         id: build
@@ -96,7 +95,7 @@ jobs:
         uses: docker/login-action@v3
         with:
           username: ${{ vars.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_PUSH_TOKEN }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_PUBLIC }}
 
       - name: Extract version from tag
         id: version
@@ -169,28 +168,3 @@ jobs:
           image: ${{ env.DOCKER_IMAGE }}:${{ steps.meta.outputs.version }}
           only-severities: critical,high
           exit-code: false
-
-  security-scan:
-    runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request'
-    permissions:
-      contents: read
-      security-events: write
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v6
-
-      - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@master
-        with:
-          scan-type: 'config'
-          scan-ref: '.'
-          format: 'sarif'
-          output: 'trivy-results.sarif'
-
-      - name: Upload Trivy results to GitHub Security
-        uses: github/codeql-action/upload-sarif@v4
-        if: always()
-        with:
-          sarif_file: 'trivy-results.sarif'
diff --git a/.github/workflows/security-scan.yaml b/.github/workflows/security-scan.yaml
new file mode 100644
index 0000000..649d15a
--- /dev/null
+++ b/.github/workflows/security-scan.yaml
@@ -0,0 +1,37 @@
+name: Security Scan
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  security-scan:
+    name: Trivy Security Scan
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: 'config'
+          scan-ref: '.'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+
+      - name: Upload Trivy results to GitHub Security
+        uses: github/codeql-action/upload-sarif@v4
+        if: always()
+        with:
+          sarif_file: 'trivy-results.sarif'
diff --git a/.trivyignore b/.trivyignore
index d074a91..14e9d8a 100644
--- a/.trivyignore
+++ b/.trivyignore
@@ -2,3 +2,5 @@
 AVD-DS-0002
 # no health check
 AVD-DS-0026
+# change directory
+AVD-DS-0013
diff --git a/CLAUDE.md b/CLAUDE.md
index 16aecd6..0e3307a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -75,14 +75,15 @@ LuaJIT is configured with `LUAJIT_NUMMODE=2` (number mode) and Lua 5.2 compatibi
 
 ## CI/CD Pipeline
 
-### GitHub Actions Workflow
+### GitHub Actions Workflows
 
-The repository uses `.github/workflows/docker-build.yml` for automated builds with a multi-stage digest-based approach:
+The repository uses two separate workflows for improved security and clarity:
+
+#### 1. Build and Push (`.github/workflows/build-and-push.yaml`)
 
 **Triggers**:
 - Push to `master`/`main` branch → Build & push to Docker Hub
 - Tags matching `*.*.*.*-*` (e.g., `1.27.1.2-0`) → Build & push with version tags
-- Pull requests → Security scan only (no build)
 - Manual dispatch → Build & push
 
 **Generated Docker Tags**:
@@ -91,19 +92,28 @@ The repository uses `.github/workflows/docker-build.yml` for automated builds wi
 - `1.27` - Two-part version
 
 **Required Secrets**:
-- `DOCKER_HUB_USERNAME` - Docker Hub username
-- `DOCKER_HUB_TOKEN` - Docker Hub access token with Read & Write permissions
+- `DOCKERHUB_USERNAME` (variable) - Docker Hub username
+- `DOCKERHUB_PUSH_TOKEN` (secret) - Docker Hub access token with Read & Write permissions
+
+#### 2. Security Scan (`.github/workflows/security-scan.yaml`)
+
+**Triggers**:
+- Pull requests to `master`/`main` branch
+
+**Purpose**:
+- Runs Trivy configuration scanner on Dockerfile and workflow files
+- Uploads results to GitHub Security tab
+- **No Docker Hub access or secrets required** - provides fast security feedback in isolation
 
 ### Build Architecture
 
-The workflow uses a three-stage process for efficient multi-platform builds:
+The build-and-push workflow uses a three-stage process for efficient multi-platform builds:
 
 1. **build** (matrix job):
    - Runs on native runners: `ubuntu-latest` (amd64), `ubuntu-latest-arm` (arm64)
    - Each platform builds independently in parallel
    - Uses digest-based push (`push-by-digest=true`) for reliable multi-arch images
    - Platform-specific cache scopes for optimal cache utilization
-   - Skipped for pull requests
 
 2. **merge**:
    - Downloads all platform digests
@@ -111,19 +121,16 @@ The workflow uses a three-stage process for efficient multi-platform builds:
    - Pushes unified multi-platform image with appropriate tags
    - Runs Docker Scout CVE scan on final image
 
-3. **security-scan** (PR only):
-   - Runs Trivy configuration scanner
-   - Uploads results to GitHub Security tab
-   - Provides fast feedback without building images
-
 ### Security Features
 
+- **Workflow Separation**: Build and security-scan workflows are completely isolated
+  - PRs never trigger workflows that access Docker Hub secrets
+  - Reduces attack surface for public repository
 - **SBOM Generation**: Enabled (`sbom: true`) for all builds to track dependencies
 - **Provenance**: Disabled (`provenance: false`) for maximum compatibility with cloud services (ECR, ACR, GCR)
 - **Vulnerability Scanning**:
   - Docker Scout (post-merge): Scans final multi-platform image for critical/high CVEs
   - Trivy (PRs only): Scans Dockerfile and configuration, uploads to GitHub Security
-- **Pull Request Isolation**: PRs run security scans only, no Docker builds or Docker Hub access
 
 ### Build Optimization