Switch to latest version of key4hep-build workflow

.github/workflows/key4hep.yml

@@ -1,11 +1,16 @@
-name: Key4hep build
+# Do not edit this file, it will be overwritten!
+# The template file can be found in
+# https://github.com/key4hep/key4hep-actions/blob/main/workflows/key4hep-build.yaml
 
+name: Key4hep build
 on:
   push:
     branches:
-    - master
+      - master
   pull_request:
   workflow_dispatch:
+  schedule:
+    - cron: "16 4 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -20,11 +25,25 @@ jobs:
         include:
           - build_type: nightly
             image: ubuntu24
+          - build_type: nightly
+            image: ubuntu26
       fail-fast: false
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/key4hep/key4hep-images/${{ matrix.image }}-cvmfs
+      options: --privileged
+      volumes:
+        - /home/runner/.cache/ccache:/root/.cache/ccache
+    defaults:
+      run:
+        shell: bash
     steps:
-    - uses: actions/checkout@v4
-    - uses: key4hep/key4hep-actions/key4hep-build@main
-      with:
-        build_type: ${{ matrix.build_type }}
-        image: ${{ matrix.image }}
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 #v7.0.1
+      - name: Mount CVMFS
+        run: /mount.sh
+      - uses: key4hep/key4hep-actions/cache-external-data@main
+      - uses: key4hep/key4hep-actions/key4hep-build@main
+        with:
+          build_type: ${{ matrix.build_type }}
+          image: ${{ matrix.image }}
+          stack: ${{ matrix.stack }}

include/DebugTool.h

@@ -87,7 +87,6 @@ class ConformalDebugger {
     // Temporarily store all mcparticles associated to this track
     std::vector<MCParticle*>      particles;
     std::map<MCParticle*, double> particleHits;
-    double                        nHits = 0.;
 
     // Get the clusters from this track
     SharedKDClusters clusters = track->m_clusters;
@@ -96,7 +95,6 @@ class ConformalDebugger {
     for (size_t itCluster = 0; itCluster < clusters.size(); itCluster++) {
       // Get the hit
       SKDCluster cluster = clusters[itCluster];
-      nHits++;
 
       // If we already have hits on this particle, then just increment the counter
       if (particleHits.count(m_kdParticles[cluster]))