Add a workflow to concretize using the latest release of spack

.github/scripts/concretize-tag-spack.sh

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+cd /
+if [ -z "$2" ]; then
+  tag=$(curl -s https://api.github.com/repos/spack/spack/releases/latest | grep '"tag_name":' | cut -d'"' -f4)
+else
+  tag="$2"
+fi
+echo "Checking out the spack tag: $tag"
+git clone https://github.com/spack/spack -q -b $tag
+source spack/share/spack/setup-env.sh
+
+cd /spack
+# git checkout $(cat /key4hep-spack/.latest-commit)
+# source /key4hep-spack/.cherry-pick
+
+if [ "$1" = "release" ]; then
+    env=key4hep-release-opt
+elif [ "$1" = "nightly" ]; then
+    env=key4hep-nightly-opt
+else
+    echo "Unknown build type"
+    exit 1
+fi
+cd /key4hep-spack/environments/${env}
+
+echo "========="
+echo "spack.yaml"
+cat spack.yaml
+echo "========="
+echo "packages.yaml"
+cat packages.yaml
+echo "========="
+echo "key4hep-common/packages.yaml"
+cat /key4hep-spack/environments/key4hep-common/packages.yaml
+echo "========="
+
+spack env activate .
+spack concretize

.github/workflows/concretize-latest-spack.yaml

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+name: Concretize latest spack
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  concretize:
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.image }}-${{ matrix.build_type }}
+      cancel-in-progress: true
+    strategy:
+      matrix:
+        image: [alma9, ubuntu22]
+        build_type: [release, nightly]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Start container
+        run: |
+            name=$(echo "${{ github.event.repository.name }}" | tr '[:upper:]' '[:lower:]')
+            if [ "${{ matrix.image }}" = "alma9" ]; then
+              docker run --name container --privileged -v ${GITHUB_WORKSPACE}:/key4hep-spack -v ~/.cache/ccache:/root/.cache/ccache -d ghcr.io/key4hep/key4hep-images/alma9-cvmfs tail -f /dev/null
+            elif [ "${{ matrix.image }}" = "ubuntu22" ]; then
+              docker run --name container --privileged -v ${GITHUB_WORKSPACE}:/key4hep-spack -v ~/.cache/ccache:/root/.cache/ccache -d ghcr.io/key4hep/key4hep-images/ubuntu22-cvmfs tail -f /dev/null
+            else
+              echo "Unknown image"
+              exit 1
+            fi
+
+      - name: Setup environment and concretize
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+
+            export GITHUB_TOKEN=${GH_TOKEN}
+
+            cat <<'EOF' > ${GITHUB_WORKSPACE}/script_container.sh
+            set -e
+
+            /key4hep-spack/.github/scripts/concretize-tag-spack.sh "${{ matrix.build_type }}"
+
+            EOF
+
+            chmod +x ${GITHUB_WORKSPACE}/script_container.sh
+
+            # cat ${GITHUB_WORKSPACE}/script_container.sh
+
+            docker exec container /bin/bash -c "/mount.sh && /key4hep-spack/script_container.sh"