Merge pull request #216 from EasyPost/luizm-action-sh-checker-review

fix(ci): pin sh-checker action and restrict workflow permissions

Author: sayo-ep

.github/workflows/ci.yml

@@ -8,11 +8,13 @@ on:
 
 jobs:
   shell:
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Run sh-checker
-        uses: luizm/action-sh-checker@master
+        uses: luizm/action-sh-checker@v0.9.0
         env:
           SHFMT_OPTS: -i 2 -d
           SHELLCHECK_OPTS: -e SC2148,SC2034