ci-workflow: perform apt update before apt install

Generally this isn't needed as GitHub CI runners update periodically,
but may help recover from temporary mirror sync flakes.

Author: jgraettinger

.github/workflows/ci-workflow.yaml

@@ -22,7 +22,7 @@ jobs:
             docker login --username ${{ github.actor }} --password-stdin ghcr.io
 
       - uses: actions/setup-go@v4
-      - run: sudo apt install -y protobuf-compiler librocksdb-dev libsqlite3-dev etcd-server
+      - run: sudo apt update && sudo apt install -y protobuf-compiler librocksdb-dev libsqlite3-dev etcd-server
       - run: echo "VERSION=$(git describe --dirty --tags)" >> "$GITHUB_ENV"
 
       - run: make go-test-ci