ci: add dockerfile and workflow action for releasing image

Dockerfile and Github action which builds and releases Docker image.
Docker image will have Nordic toolchain bundle inside it.

Signed-off-by: Kari Hamalainen <kari.hamalainen@nordicsemi.no>

Author: karhama

.github/workflows/docker.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        run: |
+          TOOLCHAIN_ID=$(../print_toolchain_checksum.sh)
+          docker build -t ghcr.io/${{ github.repository }}-toolchain:${{ github.ref_name }} --build-arg VERSION=$TOOLCHAIN_ID .
+          docker push ghcr.io/${{ github.repository }}-toolchain:${{ github.ref_name }}
+        working-directory: scripts/docker

scripts/docker/Dockerfile

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+FROM ubuntu:22.04 as nrfutil-builder
+
+ARG VERSION
+RUN apt-get update && apt-get install -y \
+    wget \
+    && rm -rf /var/lib/apt/lists/*
+RUN wget https://developer.nordicsemi.com/.pc-tools/nrfutil/x64-linux/nrfutil && chmod +x nrfutil \
+    && ./nrfutil install toolchain-manager && ./nrfutil toolchain-manager install --toolchain-bundle-id $VERSION
+RUN  ./nrfutil toolchain-manager env --as-script > /root/toolchain-env.sh
+
+
+FROM ubuntu:22.04
+
+# Link to repo (https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#labelling-container-images)
+LABEL org.opencontainers.image.source=https://github.com/nrfconnect/sdk-nrf
+# Set metadata for an image
+LABEL org.opencontainers.image.description="This image contains toolchain for sdk-nrf."
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy toolchain
+COPY --from=nrfutil-builder /root/ncs/toolchains /root/ncs/toolchains
+COPY --from=nrfutil-builder /root/toolchain-env.sh /root/toolchain-env.sh
+
+# Add entrypoint which calls toolchain-env.sh
+ADD entrypoint.sh /root/entrypoint.sh
+ENTRYPOINT ["/root/entrypoint.sh"]
+CMD ["bin/bash"]

scripts/docker/entrypoint.sh

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+#! /bin/bash
+
+source /root/toolchain-env.sh
+exec "$@"