Install node20 in containers

.github/workflows/ci.yml

@@ -64,9 +64,13 @@ jobs:
                 # Need (newer) git, and the older Ubuntu container may require requesting the key manually using port 80
                 curl -sSL --retry ${NET_RETRY_COUNT:-5} 'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0xE1DD270288B4E6030699E45FA1715D88E1DF1F24' | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/git-core_ubuntu_ppa.gpg
                 for i in {1..${NET_RETRY_COUNT:-3}}; do sudo -E add-apt-repository -y ppa:git-core/ppa && break || sleep 10; done
+                # Node 20 required for GH-actions
+                sudo mkdir -p /etc/apt/keyrings
+                curl -sSL --retry ${NET_RETRY_COUNT:-5} 'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2F59B5F99B1BE0B4' | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+                echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] http://deb.nodesource.com/node_20.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
                 apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
                 osver=$(lsb_release -sr | cut -f1 -d.)
-                pkgs="g++ git"
+                pkgs="g++ git nodejs"
                 # Ubuntu 22+ has only Python 3 in the repos
                 if [ -n "$osver" ] && [ "$osver" -ge "22" ]; then
                   pkgs+=" python-is-python3 libpython3-dev"
@@ -80,12 +84,6 @@ jobs:
                 echo "B2_USE_CCACHE=0" >> $GITHUB_ENV
             fi
             git config --global pack.threads 0
-            if [[ "${{matrix.container}}" == "ubuntu:16.04" ]] || [[ "${{matrix.container}}" == "ubuntu:18.04" ]]; then
-              # Ubuntu 16/18 can't run Node 20, so stick to older actions: https://github.com/actions/checkout/issues/1590
-              echo "GHA_USE_NODE_20=false" >> $GITHUB_ENV
-            else
-              echo "GHA_USE_NODE_20=true" >> $GITHUB_ENV
-            fi
 
       - uses: actions/checkout@v3
         if: env.GHA_USE_NODE_20 == 'false'