Add lint mode (#120)

Signed-off-by: Cristian Klein <[email protected]>

action.sh

@@ -38,6 +38,9 @@ if [ -n "${GITHUB_TOKEN}" ]; then
 elif [ -n "${PERSONAL_TOKEN}" ]; then
     print_info "setup with PERSONAL_TOKEN"
     remote_repo="https://x-access-token:${PERSONAL_TOKEN}@${GITHUB_DOMAIN:-"github.com"}/${GITHUB_REPOSITORY}.git"
+else
+    print_info "no token found; linting"
+    exec -- mkdocs build --strict
 fi
 
 if ! git config --get user.name; then