CI: set nodejs version to 10 on main scripts

nvm can run within a bash shell only.

ci/install.sh

@@ -22,6 +22,8 @@ echo "Install neovim RubyGem."
 gem install --no-document --version ">= 0.8.0" neovim
 
 echo "Install neovim npm package"
+source ~/.nvm/nvm.sh
+nvm use 10
 npm install -g neovim
 npm link neovim
 

ci/run_tests.sh

@@ -19,6 +19,8 @@ exit_suite --continue
 
 enter_suite tests
 
+source ~/.nvm/nvm.sh
+nvm use 10
 export TREE_SITTER_DIR=$HOME/tree-sitter-build/
 
 if test "$CLANG_SANITIZER" != "TSAN" ; then