ci: add a checkmake workflow

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

Author: obnoxxx

.github/workflows/checkmake.yaml

@@ -0,0 +1,35 @@
+name: CheckMake
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+      - release-*
+  pull_request:
+    branches:
+      - main
+      - release-*
+
+# cancel the in-progress workflow when PR is refreshed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  checkmake:
+    name: CheckMake
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    # checkmake uses go run, so this needs go installed
+          - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version: 'stable'
+      id: go
+      - name: Run CheckMake
+        run: make checkmake