image-push/action.yaml

name: Push Image
description: Push a locally-built image to code.fritzlab.net and prune old numeric tags.
inputs:
  image:
    description: Full image name without tag (e.g. code.fritzlab.net/fritzlab/chrony)
    required: true
  tag:
    description: Tag to push. Defaults to github.run_number when empty.
    required: false
    default: ''
  token:
    description: CI_BOT_TOKEN — registry login + Gitea package API for cleanup
    required: true
  org:
    description: Gitea org for package API (e.g. fritzlab, dns)
    required: true
  name:
    description: Package/image name (e.g. chrony, base, runner)
    required: true
  latest:
    description: Also push a :latest tag
    required: false
    default: 'true'
  keep:
    description: Numeric tags to retain after prune; older ones are deleted
    required: false
    default: '3'
runs:
  using: composite
  steps:
    - name: Log in to registry
      uses: docker/login-action@v3
      with:
        registry: code.fritzlab.net
        username: ci-bot
        password: ${{ inputs.token }}

    - name: Push
      shell: bash
      env:
        IMAGE: ${{ inputs.image }}
        TAG_INPUT: ${{ inputs.tag }}
        RUN_NUMBER: ${{ github.run_number }}
        LATEST: ${{ inputs.latest }}
      run: |
        set -euo pipefail
        TAG="${TAG_INPUT:-$RUN_NUMBER}"
        echo "Pushing ${IMAGE}:${TAG}"
        docker push "${IMAGE}:${TAG}"
        if [ "$LATEST" = "true" ]; then
          docker tag "${IMAGE}:${TAG}" "${IMAGE}:latest"
          echo "Pushing ${IMAGE}:latest"
          docker push "${IMAGE}:latest"
        fi

    - name: Prune old tags
      continue-on-error: true
      shell: bash
      env:
        TOKEN: ${{ inputs.token }}
        ORG: ${{ inputs.org }}
        NAME: ${{ inputs.name }}
        KEEP: ${{ inputs.keep }}
      run: |
        set -euo pipefail
        tea login add --name ci --url https://code.fritzlab.net \
          --token "$TOKEN" --no-version-check >/dev/null 2>&1 || true
        # Paginate the package list. The org has more container versions than a
        # single API page returns (Gitea caps page size at MAX_RESPONSE_ITEMS),
        # so an unpaginated call silently drops a package's older tags from the
        # list and they never get pruned — that's how tags crept past KEEP.
        page=1
        while :; do
          resp=$(tea api "/packages/${ORG}?type=container&limit=50&page=${page}")
          [ "$(jq 'length' <<<"$resp")" -eq 0 ] && break
          jq -r --arg n "$NAME" \
            '.[] | select(.name==$n) | select(.version | test("^[0-9]+$")) | .version' \
            <<<"$resp"
          page=$((page + 1))
        done \
          | sort -n | head -n -"$KEEP" \
          | while read -r tag; do
              echo "deleting ${NAME}:$tag"
              tea api -X DELETE "/packages/${ORG}/container/${NAME}/${tag}"
            done

    - name: Untag local image
      # image-build loads the built image into the runner's dind (load: true).
      # Nothing needs the local tag after the push, but the tags used to pile up
      # forever in the pod's dind image store (dozens of stale 2-3GB tags). Untag
      # after pushing to reclaim the store; the buildkit BUILD cache is separate
      # and refcounts its own layers, so the next build of this image is still
      # warm. (When THIS repo is `runner`, untagging :latest costs the pod's next
      # job one ~380MB re-pull of the job image from the local registry — cheap.)
      # The image prune sweeps the now-dangling previous :latest that a re-tag
      # orphans; it only removes untagged images no container/tag references, so
      # shared layers survive.
      continue-on-error: true
      shell: bash
      env:
        IMAGE: ${{ inputs.image }}
        TAG_INPUT: ${{ inputs.tag }}
        RUN_NUMBER: ${{ github.run_number }}
        LATEST: ${{ inputs.latest }}
      run: |
        TAG="${TAG_INPUT:-$RUN_NUMBER}"
        docker rmi "${IMAGE}:${TAG}" || true
        if [ "$LATEST" = "true" ]; then
          docker rmi "${IMAGE}:latest" || true
        fi
        docker image prune -f || true