ci: add trivy workflow and gate docker push on image scan

.github/workflows/docker.yml

@@ -10,6 +10,11 @@ on:
     branches:
       - "master"
 
+permissions:
+  contents: read
+  packages: write
+  security-events: write
+
 jobs:
   build-docker:
     runs-on: ubuntu-latest
@@ -60,6 +65,32 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
 
+      - name: Build image for scanning
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/amd64
+          push: false
+          load: true
+          tags: drone-discord:scan
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@v0.35.0
+        with:
+          image-ref: "drone-discord:scan"
+          format: "sarif"
+          output: "trivy-image-results.sarif"
+          severity: "CRITICAL,HIGH"
+          exit-code: '1'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v4
+        if: always()
+        with:
+          sarif_file: "trivy-image-results.sarif"
+          category: "trivy-docker-image"
+
       - name: Build and push
         uses: docker/build-push-action@v7
         with:

.github/workflows/trivy.yml

@@ -0,0 +1,84 @@
+name: Trivy Security Scan
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  trivy-repo-scan:
+    name: Trivy Repository Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Run Trivy vulnerability scanner (repo)
+        uses: aquasecurity/trivy-action@v0.35.0
+        with:
+          scan-type: "fs"
+          scan-ref: "."
+          format: "sarif"
+          output: "trivy-repo-results.sarif"
+          severity: "CRITICAL,HIGH"
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v4
+        if: always()
+        with:
+          sarif_file: "trivy-repo-results.sarif"
+
+  trivy-image-scan:
+    name: Trivy Image Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          check-latest: true
+
+      - name: Build binary
+        run: |
+          make build_linux_amd64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Build Docker image for scanning
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/amd64
+          push: false
+          load: true
+          tags: drone-discord:scan
+
+      - name: Run Trivy vulnerability scanner (image)
+        uses: aquasecurity/trivy-action@v0.35.0
+        with:
+          image-ref: "drone-discord:scan"
+          format: "sarif"
+          output: "trivy-image-results.sarif"
+          severity: "CRITICAL,HIGH"
+
+      - name: Upload Trivy image scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v4
+        if: always()
+        with:
+          sarif_file: "trivy-image-results.sarif"
+          category: "trivy-image"