Remove trivvy scanning since environment is not supported

.github/workflows/build.yml

@@ -67,26 +67,3 @@ jobs:
         env:
           COSIGN_EXPERIMENTAL: "true"
           TAGS: ${{ steps.meta.outputs.tags }}
-          
-  scan:
-    name: Scan current image & report results
-    needs: build
-    runs-on: "ubuntu-latest"
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@master
-        with:
-          image-ref: 'ghcr.io/tommytran732/synapse'
-          format: 'template'
-          template: '@/contrib/sarif.tpl'
-          output: 'trivy-results.sarif'
-          severity: 'CRITICAL,HIGH'
-          vuln-type: "os"
-
-      - name: Upload Trivy scan results to GitHub Security tab
-        uses: github/codeql-action/upload-sarif@v2
-        with:
-          sarif_file: 'trivy-results.sarif'

.github/workflows/scan.yml

@@ -1,29 +0,0 @@
-name: Scan
-
-on:
-  schedule:
-    # Scan the image regularly (once a day)
-    - cron: '0 23 * * *'
-
-jobs:
-  scan:
-    name: Scan current image & report results
-    runs-on: "ubuntu-latest"
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@master
-        with:
-          image-ref: 'ghcr.io/tommytran732/matrix.to'
-          format: 'template'
-          template: '@/contrib/sarif.tpl'
-          output: 'trivy-results.sarif'
-          severity: 'CRITICAL,HIGH'
-          vuln-type: "os"
-
-      - name: Upload Trivy scan results to GitHub Security tab
-        uses: github/codeql-action/upload-sarif@v2
-        with:
-          sarif_file: 'trivy-results.sarif'

README.md

@@ -9,4 +9,3 @@ This is my own Docker image building from [the official repository](https://gith
 - Don't trust random images: build yourself if you can.
 - Default Element instance is changed from [Element.io](https://app.element.io) to [ArcticFoxes.net](https://element.arcticfoxes.net)
 - The Dockerfile builds from the main branch, as releases do not come out frequently.
-- Images from `ghcr.io` are built every week and scanned every day for critical vulnerabilities with Trivy. I recommend that you use these images.