fix: remove GHCR login for fork-friendly workflow

All midnight-ntwrk images are public alphas, no auth needed.

Author: cosmir17

.github/workflows/scan.yaml

@@ -51,7 +51,6 @@ jobs:
     permissions:
       actions: read
       contents: read
-      packages: read
       security-events: write
       statuses: write
     steps:
@@ -60,9 +59,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Login to GitHub Container Registry
-        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin
-
       - name: Scan images
         env:
           CFG_PRESET: ${{ matrix.cfg_preset }}