chore(coprocessor): fix registry access

Author: tawadaa

.github/workflows/coprocessor-cargo-tests.yml

@@ -63,6 +63,13 @@ jobs:
         key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
         restore-keys: ${{ runner.os }}-cargo-
 
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Init database
       run: make init_db
       working-directory: coprocessor/fhevm-engine/coprocessor