Add deadcode to the github test suite

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

.github/workflows/check.yml

@@ -58,6 +58,20 @@ jobs:
       - name: Check Warewulf code for formatting (golang ${{ matrix.go-version }})
         run: test "$(make -s fmt | wc -l)" == 0
 
+  deadcode:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ['1.21', '1.22', '1.23']
+    steps:
+      - name: Checkout Warewulf
+        uses: actions/checkout@v4
+      - uses: ./.github/actions/prepare
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Check for dead Warewulf code (golang ${{ matrix.go-version }})
+        run: make deadcode
+
   testsuite:
     runs-on: ubuntu-latest
     strategy: