Improve Readme to remove docker build step (#43)

* Remove docker build step

* Update README.md

Co-authored-by: Simar <[email protected]>

Author: rahul2393

README.md

@@ -107,10 +107,6 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
-      - name: Build an image from Dockerfile
-        run: |
-          docker build -t docker.io/my-organization/my-app:${{ github.sha }} .
-
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@master
         with:
@@ -147,11 +143,7 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
-
-      - name: Build an image from Dockerfile
-        run: |
-          docker build -t docker.io/my-organization/my-app:${{ github.sha }} .
-
+        
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with:
@@ -188,15 +180,11 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
-
-      - name: Build an image from Dockerfile
-        run: |
-          docker build -t docker.io/my-organization/my-app:${{ github.sha }} .
-
+        
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with:
-          image-ref: 'docker.io/my-organization/my-app:${{ github.sha }}'
+          image-ref: 'aws_account_id.dkr.ecr.region.amazonaws.com/imageName:${{ github.sha }}'
           format: 'template'
           template: '@/contrib/sarif.tpl'
           output: 'trivy-results.sarif'
@@ -229,11 +217,7 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
-
-      - name: Build an image from Dockerfile
-        run: |
-          docker build -t docker.io/my-organization/my-app:${{ github.sha }} .
-
+        
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with:
@@ -267,11 +251,7 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
-
-      - name: Build an image from Dockerfile
-        run: |
-          docker build -t docker.io/my-organization/my-app:${{ github.sha }} .
-
+        
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         with: