Update shellcheck workflow

fix #34

.github/workflows/shellcheck_and_shellfmt.yml

@@ -4,7 +4,7 @@ on:
   - push
   - pull_request
 jobs:
-  sh-checker:
+  shellfmt:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
@@ -13,10 +13,17 @@ jobs:
         uses: luizm/action-sh-checker@v0.1.10
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Optional if sh_checker_comment is false.
-          SHELLCHECK_OPTS: --color=always --shell=bash -x --source-path=SCRIPTDIR # Optional: exclude some shellcheck warnings.
           SHFMT_OPTS: -l -i 4 -w # Optional: pass arguments to shfmt.
         with:
+          sh_checker_shellcheck_disable: true
           sh_checker_comment: true
           sh_checker_exclude: |
                               src/
                               debian/postrm
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Run shellcheck
+        run: ./shellcheck/docker_build_and_run_shellcheck.sh