ci(workflows): 💚 Try to confirm and fix CI error:0308010C

There might be a conflict between the new version node.js and this project's dependencies, according to CI Error message "error:0308010C:digital envelope routines::unsupported". Try to confirm and fix it by specifying the old styled openssl.

.github/workflows/ci.yaml

@@ -68,6 +68,7 @@ jobs:
           PCIT_USERNAME: khs1994
       - name: vuepress
         run: |
+          export NODE_OPTIONS=--openssl-legacy-provider
           sudo rm -rf _book
           # npm i vuepress --save-dev
           npm i