compile akmods in seperate image to avoid mismatch of kernel versions because of caching.

.github/workflows/kernel-akmods.yml

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+name: kernel-akmods
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+on:
+  schedule:
+    - cron: '0 4 */3 * *'  # 4 am every 3rd day
+  push:
+    paths:
+        - 'kernel-akmods.Dockerfile'
+
+env:
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  IMAGE_NAME: ${{ github.repository_owner }}/my-ostree-os-kernel-akmods
+  IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }}
+
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Maximize build space
+        uses: AdityaGarg8/remove-unwanted-software@v1
+        with:
+          remove-dotnet: 'true'
+          remove-android: 'true'
+          remove-haskell: 'true'
+
+      - name: Get current date
+        id: date
+        run: echo "::set-output name=date::$(date +'%Y%m%d')"
+
+      - name: Test with environment variables
+        run: echo $DATE
+        env:
+          DATE: ${{ steps.date.outputs.date }}
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
+        with:
+          cosign-release: 'v2.1.1'
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+
+      # Build image using Buildah action
+      - name: Build Image
+        id: build_image
+        uses: redhat-actions/buildah-build@v2
+        with:
+          containerfiles: |
+            ./kernel-akmods.Dockerfile
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ steps.meta.outputs.tags }} ${{ steps.meta.outputs.tags }}-40 ${{ steps.meta.outputs.tags }}-40.${{ steps.date.outputs.date }}
+          oci: false
+
+      # Workaround bug where capital letters in your GitHub username make it impossible to push to GHCR.
+      # https://github.com/macbre/push-to-ghcr/issues/12
+      - name: Lowercase Registry
+        id: registry_case
+        uses: ASzc/change-string-case-action@v5
+        with:
+          string: ${{ env.IMAGE_REGISTRY }}
+
+      # Push the image to GHCR (Image Registry)
+      - name: Push To GHCR
+        uses: redhat-actions/push-to-registry@v2
+        id: push
+        if: github.event_name != 'pull_request'
+        env:
+          REGISTRY_USER: ${{ github.actor }}
+          REGISTRY_PASSWORD: ${{ github.token }}
+        with:
+          image: ${{ steps.build_image.outputs.image }}
+          tags: ${{ steps.build_image.outputs.tags }}
+          registry: ${{ steps.registry_case.outputs.lowercase }}
+          username: ${{ env.REGISTRY_USER }}
+          password: ${{ env.REGISTRY_PASSWORD }}
+          extra-args: |
+            --disable-content-trust
+
+
+
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

kernel-akmods.Dockerfile

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+FROM fedora:40 AS akmods-builder
+
+RUN dnf -y update && dnf -y install wget
+
+RUN dnf -y install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
+
+# Update cachebust in case a rebuild is required without usage of cache.
+ARG CACHEBUST=11
+
+RUN cd /etc/yum.repos.d/ && \
+wget https://copr.fedorainfracloud.org/coprs/bieszczaders/kernel-cachyos-lto/repo/fedora-$(rpm -E %fedora)/bieszczaders-kernel-cachyos-lto-fedora-$(rpm -E %fedora).repo && \
+wget https://copr.fedorainfracloud.org/coprs/andersrh/kernel-cachyos/repo/fedora-$(rpm -E %fedora)/andersrh-kernel-cachyos-fedora-$(rpm -E %fedora).repo && \
+wget https://copr.fedorainfracloud.org/coprs/bieszczaders/kernel-cachyos-addons/repo/fedora-$(rpm -E %fedora)/bieszczaders-kernel-cachyos-addons-fedora-$(rpm -E %fedora).repo && \
+cd /tmp
+
+RUN dnf -y install kernel-cachyos-lto kernel-cachyos-lto-headers kernel-cachyos-lto-devel kernel-cachyos-lto-modules kernel-cachyos-lto-core kernel-cachyos-lto-devel-matched
+RUN dnf -y install akmod-nvidia akmod-VirtualBox
+
+COPY akmods.sh /tmp/akmods.sh
+RUN /tmp/akmods.sh
+
+FROM scratch
+
+COPY --from=akmods-builder /var/cache/akmods/*/* /