ci: add GHCR authentication for ledger integration tests

Author: evansims

.github/workflows/ci.yml

@@ -212,6 +212,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
+      packages: read
     timeout-minutes: 10
     env:
       CARGO_INCREMENTAL: 0
@@ -247,6 +248,13 @@ jobs:
           shared-key: management-ubuntu-latest-x86_64-unknown-linux-gnu
           save-if: false
 
+      - name: Log in to GitHub Container Registry
+        uses: step-security/docker-login-action@c3e677aae8393bc9c81cfdf9709648720ea4bd4d # v3.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Start Ledger server
         working-directory: docker/ledger-integration-tests
         run: |