fix: trivy action config (#6)

Author: pranc1ngpegasus

.github/workflows/trivy.yml

@@ -7,17 +7,14 @@ jobs:
   trivy:
     name: Security check
     runs-on: ubuntu-latest
-    env:
-      IMAGE_NAME: docker.io/pranc1ngpegasus/go-template
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
-      - name: Build an image from Dockerfile
-        run: docker build -t ${{ env.IMAGE_NAME }}:${{ github.sha }} .
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with:
-          image-ref: '${{ env.IMAGE_NAME }}:${{ github.sha }}'
+          scan-type: 'fs'
+          scan-ref: '.'
           format: 'sarif'
           output: 'trivy-results.sarif'
       - name: Upload Trivy scan results to GitHub Security tab