ci: fix ci workflow

this was missing installation of dependencies

Signed-off-by: Michael Adam <obnox@samba.org>

Author: obnoxxx

.github/workflows/ci.yml

@@ -34,6 +34,14 @@ jobs:
       uses: actions/checkout@v6
       with:
         fetch-depth: 1
+    - name: Install dependencies (shellcheck)
+      if: matrix.os == 'macos-latest'
+      run: |
+        brew install shellcheck
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt update
+        sudo apt install -y shellcheck
 
     - name: run checks
       run: make check