add missing apt-get install jq

.forgejo/workflows/deploy.yml

@@ -15,6 +15,8 @@ jobs:
           fetch-depth: 0
       - name: Install latest mdbook
         run: |
+          apt-get update -qq
+          apt-get install -qq --yes jq
           tag="$(curl 'https://api.github.com/repos/rust-lang/mdbook/releases/latest' | jq -r '.tag_name')"
           url="https://github.com/rust-lang/mdbook/releases/download/${tag}/mdbook-${tag}-x86_64-unknown-linux-gnu.tar.gz"
           mkdir mdbook