Add GitLab CI pipeline generator code and Dockerfile

.github/workflows/gitlab-container-image.yml

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+---
+name: Build & Push GitLab Container Image
+
+"on":
+  push:
+    branches:
+      - main
+    tags:
+      - v*
+  pull_request: {}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      IMAGE: ${{ github.repository }}/gitlab
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Set image version latest
+        if: github.ref == 'refs/heads/main'
+        run: echo "VERSION=latest" >> ${GITHUB_ENV}
+      - name: Set image version for PRs to branch name
+        if: github.event_name == 'pull_request'
+        run: echo "VERSION=${GITHUB_REF_NAME//\//-}" >> ${GITHUB_ENV}
+      - name: Set image version from tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: echo "VERSION=$(echo ${GITHUB_REF#refs/tags/})" >> ${GITHUB_ENV}
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v6
+        with:
+          context: '{{defaultContext}}:gitlab'
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: 'ghcr.io/${{ env.IMAGE }}:${{ env.VERSION }}'

gitlab/Dockerfile

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+FROM docker.io/library/alpine:latest
+
+RUN apk add --no-cache yamllint jsonnet jq curl
+COPY ./bin/* /usr/local/bin/
+COPY ./commodore-compile.jsonnet /opt/commodore-compile.jsonnet

gitlab/bin/step-render-pipeline

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+#!/bin/sh
+set -e -u -x
+
+cluster_catalog_urls=""
+for c in ${CLUSTERS}; do
+  r=$(curl -sH"Authorization: Bearer ${COMMODORE_API_TOKEN}" "${COMMODORE_API_URL}/clusters/${c}" | jq -r .gitRepo.url)
+  cluster_catalog_urls="${cluster_catalog_urls}${c}=${r} "
+done
+
+jsonnet \
+  --ext-str clusters="${CLUSTERS}" \
+  --ext-str memory_limits="${MEMORY_LIMITS:-}" \
+  --ext-str cpu_limits="${CPU_LIMITS:-}" \
+  --ext-str cpu_requests="${CPU_REQUESTS:-}" \
+  --ext-str cluster_catalog_urls="${cluster_catalog_urls}" \
+  --ext-str server_fqdn="${CI_SERVER_FQDN}" \
+  --ext-str server_ssh_host="${CI_SERVER_SHELL_SSH_HOST}" \
+  /opt/commodore-compile.jsonnet \
+  > generated-commodore-compile.yml

gitlab/bin/step-yamllint

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+#!/bin/sh
+set -e -u -x
+
+if [ "$(find . -name '.yamllint' -or -name '.yamllint.y*ml' | wc -l)" -ge "1" ]; then
+  # yamllint will autoload this file
+  exec yamllint .
+else
+  exec yamllint -d "$YAMLLINT_DEFAULTS" .
+fi

gitlab/commodore-compile.jsonnet

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+local commodore_version = 'v1.22.1';
+local commodore_image = 'docker.io/projectsyn/commodore:' + commodore_version;
+
+local to_array(param) = std.foldl(
+  function(obj, elem)
+    local parts = std.split(elem, '=');
+    obj {
+      [parts[0]]: parts[1],
+    },
+  std.split(std.extVar(std.rstripChars(param, ' ')), ' '),
+  {},
+);
+
+local gitlab_fqdn = std.extVar('server_fqdn');
+local gitlab_ssh_host = std.extVar('server_ssh_host');
+local clusters = std.split(std.extVar('clusters'), ' ');
+local cluster_catalog_urls = to_array('cluster_catalog_urls');
+local memory_limits = to_array('memory_limits');
+local cpu_limits = to_array('cpu_limits');
+local cpu_requests = to_array('cpu_requests');
+
+local gitInsteadOf(cluster) =
+  local cluster_access_token = '${ACCESS_TOKEN_%s}' % std.strReplace(cluster, '-', '_');
+  local cluster_repo = cluster_catalog_urls[cluster];
+  local ssh_gitlab = 'ssh://git@%s/' % gitlab_ssh_host;
+  local catalog_path = if std.startsWith(cluster_repo, ssh_gitlab) then
+    // prefix ssh://git@<host> 0 == ssh, 1 == '', 2 == <host>
+    std.join('/', std.split(cluster_repo, '/')[3:]);
+
+  local catalogInsteadOf =
+    if catalog_path != null then
+      [
+        'git config --global url."https://gitlab-ci-token:%(access_token)s@%(gitlab_fqdn)s/%(catalog_path)s".insteadOf ssh://git@${CI_SERVER_SHELL_SSH_HOST}/%(catalog_path)s' % {
+          access_token: cluster_access_token,
+          catalog_path: catalog_path,
+          gitlab_fqdn: gitlab_fqdn,
+        },
+      ]
+    else
+      [];
+
+  [
+    'git config --global url."https://gitlab-ci-token:${CI_JOB_TOKEN}@%(gitlab_fqdn)s".insteadOf ssh://git@${CI_SERVER_SHELL_SSH_HOST}' % {
+      gitlab_fqdn: gitlab_fqdn,
+    },
+  ] + catalogInsteadOf;
+
+local compile_job(cluster) =
+  {
+    stage: 'build',
+    image:
+      {
+        name: commodore_image,
+      },
+    variables:
+      {
+        KUBERNETES_MEMORY_LIMIT: std.get(memory_limits, cluster, '2Gi'),
+        KUBERNETES_CPU_LIMIT: std.get(cpu_limits, cluster, '2'),
+        KUBERNETES_CPU_REQUEST: std.get(cpu_requests, cluster, '800m'),
+      },
+    before_script:
+      [
+        'install --directory --mode=0700 ~/.ssh',
+        'echo "$SSH_KNOWN_HOSTS" >> ~/.ssh/known_hosts',
+        'echo "$SSH_CONFIG" >> ~/.ssh/config',
+      ],
+    script:
+      gitInsteadOf(cluster) + [
+        '/usr/local/bin/entrypoint.sh commodore catalog compile --tenant-repo-revision-override $CI_COMMIT_SHA ' + cluster,
+        '(cd catalog/ && git --no-pager diff --staged --output ../diff.txt)',
+      ],
+    artifacts:
+      {
+        paths:
+          [
+            'diff.txt',
+          ],
+        expire_in: '1 week',
+      },
+    rules:
+      [
+        { 'if': '$CI_COMMIT_REF_NAME != $CI_DEFAULT_BRANCH' },
+      ],
+  };
+
+local deploy_job(cluster) =
+  {
+    stage: 'deploy',
+    variables:
+      {
+        KUBERNETES_MEMORY_LIMIT: std.get(memory_limits, cluster, default='2Gi'),
+        KUBERNETES_CPU_LIMIT: std.get(cpu_limits, cluster, default='2'),
+        KUBERNETES_CPU_REQUEST: std.get(cpu_requests, cluster, default='800m'),
+      },
+    image:
+      {
+        name: commodore_image,
+      },
+    before_script:
+      [
+        'install --directory --mode=0700 ~/.ssh',
+        'echo "$SSH_KNOWN_HOSTS" >> ~/.ssh/known_hosts',
+        'echo "$SSH_CONFIG" >> ~/.ssh/config',
+      ],
+    script:
+      gitInsteadOf(cluster) + [
+        '/usr/local/bin/entrypoint.sh commodore catalog compile --push ' + cluster,
+      ],
+    rules:
+      [
+        { 'if': '$CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH' },
+      ],
+  };
+
+local compile =
+  {
+    [x + '_compile']: compile_job(x)
+    for x in clusters
+  };
+
+local deploy =
+  {
+    [x + '_deploy']: deploy_job(x)
+    for x in clusters
+  };
+
+compile + deploy