fix GH path specification

Author: baileympearson

.github/workflows/build_docs.yml

@@ -27,7 +27,7 @@ jobs:
           apt-get update && apt-get install curl
           mkdir ~/hugo 
           curl -L https://github.com/gohugoio/hugo/releases/download/v0.150.0/hugo_0.150.0_linux-arm.tar.gz | tar -xzf - -C ~/hugo
-          echo "$PATH:~/hugo" >> $GITHUB_PATH
+          echo "~/hugo" >> $GITHUB_PATH
       - name: Build Docs
         run: npm run build:docs -- --yes
       - name: Open Pull Request