Use container images based on software layer's build node images

.github/workflows/build-and-publish-build-node-container.yml

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+name: Build and publish EESSI Docker image used for building the compatibility layer
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - Dockerfile.build-node-compat-layer-*
+      - bootstrap-prefix.sh
+
+  pull_request:
+    branches:
+      - main
+    paths:
+      - Dockerfile.build-node-compat-layer-*
+      - bootstrap-prefix.sh
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  build_and_publish:
+    name: Build and publish image
+    runs-on: ubuntu-24.04-arm
+    permissions:
+      packages: write
+    strategy:
+      matrix:
+        include:
+          - os: 'debian-12'
+            platform: 'amd64, arm64'
+          - os: 'debian-13'
+            platform: 'amd64, arm64, riscv64'
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Convert and store repository owner in lowercase
+        run: |
+          echo "REPOSITORY_OWNER=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
+      - name: Build and push to GitHub Packages
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+        with:
+          tags: ghcr.io/${{ env.REPOSITORY_OWNER }}/build-node-compat-layer:${{ matrix.os }}
+          file: Dockerfile.build-node-compat-layer-${{ matrix.os }}
+          platforms: ${{ matrix.platform }}
+          push: ${{ github.event_name != 'pull_request' }}

Dockerfile.build-node-compat-layer-debian-12

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+FROM ghcr.io/eessi/build-node:debian12
+
+COPY bootstrap-prefix.sh /usr/local/bin/bootstrap-prefix.sh
+
+RUN apt-get update
+RUN apt-get install -y gcc g++ make diffutils libgmp-dev perl wget
+RUN apt-get install -y git python3-pip python3-cryptography python3-venv
+RUN python3 -m venv --system-site-packages /opt/ansible && \
+    . /opt/ansible/bin/activate && \
+    pip3 install --upgrade pip && \
+    pip3 install ansible && \
+    ln -s /opt/ansible/bin/ansible* /usr/local/bin/ && \
+    deactivate
+RUN chmod 755 /usr/local/bin/bootstrap-prefix.sh
+
+ENV LC_ALL=C.UTF-8
+ENV PATH=/usr/local/bin:$PATH
+
+RUN groupadd -g 1001 portage && useradd -ms /bin/bash -u 1001 -g portage portage
+
+ENTRYPOINT ["/usr/local/bin/bootstrap-prefix.sh"]

Dockerfile.build-node-compat-layer-debian-13

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+FROM ghcr.io/eessi/build-node:debian13
+
+COPY bootstrap-prefix.sh /usr/local/bin/bootstrap-prefix.sh
+
+RUN apt-get update
+RUN apt-get install -y gcc g++ make diffutils libgmp-dev perl wget rustc
+RUN apt-get install -y git python3-pip python3-cryptography python3-venv
+RUN python3 -m venv --system-site-packages /opt/ansible && \
+    . /opt/ansible/bin/activate && \
+    pip3 install --upgrade pip && \
+    pip3 install ansible && \
+    ln -s /opt/ansible/bin/ansible* /usr/local/bin/ && \
+    deactivate
+RUN chmod 755 /usr/local/bin/bootstrap-prefix.sh
+
+ENV LC_ALL=C.UTF-8
+ENV PATH=/usr/local/bin:$PATH
+
+RUN groupadd -g 1001 portage && useradd -ms /bin/bash -u 1001 -g portage portage
+
+ENTRYPOINT ["/usr/local/bin/bootstrap-prefix.sh"]