Update jtex workflow to use local npm installation path

.forgejo/workflows/jtex.yml

@@ -4,9 +4,6 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
-env:
-  PATH: "$HOME/.local/bin:$PATH"
-  npm_config_prefix: "$HOME/.local"
 jobs:
   test:
     name: test template.yml
@@ -14,5 +11,5 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
-      - run: npm install -g jtex
-      - run: jtex check
+      - run: npm install -g jtex --prefix ./.local
+      - run: ./.local/bin/jtex check