Separate workflows

.github/workflows/images.yml

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+on:
+  workflow_call:
+    inputs:
+      test:
+        required: false
+        type: boolean
+    secrets: inherit
+jobs:
+  images:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        dvc: [1, 2]
+        base: [0, 1]
+        gpu: [false, true]
+        include:
+          - base: 0
+            ubuntu: 18.04
+            python: 2.7
+            cuda: 10.1
+            cudnn: 7
+          - base: 1
+            ubuntu: 20.04
+            python: 3.8
+            cuda: 11.2.1
+            cudnn: 8
+          - latest: true # update the values below after introducing a new major version
+            base: 1
+            dvc: 2
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.ref }}
+          fetch-depth: 0
+      - name: Metadata
+        id: metadata
+        run: |
+          latest_tag=$(git describe --tags | cut -d- -f1)
+          cml_version=${latest_tag##v}
+          dvc_version=$(python3 -c '
+          from distutils.version import StrictVersion as Ver
+          from urllib.request import urlopen
+          from json import load
+          data = load(urlopen("https://pypi.org/pypi/dvc/json"))
+          ver_pre = "${{ matrix.dvc }}".rstrip(".") + "."
+          print(
+              max(
+                  (i.strip() for i in data["releases"] if i.startswith(ver_pre)),
+                  default="${{ matrix.dvc }}",
+                  key=Ver
+              )
+          )')
+          echo ::set-output name=cache_tag::${cml_version}-${dvc_version}-${{ matrix.base }}-${{ matrix.gpu }}
+          echo ::set-output name=cml_version::$cml_version
+          tag=${cml_version//.*/}-dvc${{ matrix.dvc }}-base${{ matrix.base }}
+          if [[ ${{ matrix.gpu }} == true ]]; then
+            echo ::set-output name=base::nvidia/cuda:${{ matrix.cuda }}-cudnn${{ matrix.cudnn }}-runtime-ubuntu${{ matrix.ubuntu }}
+            tag=${tag}-gpu
+          else
+            echo ::set-output name=base::ubuntu:${{ matrix.ubuntu }}
+          fi
+
+          TAGS="$(
+            for registry in docker.io/{dvcorg,iterativeai} ghcr.io/iterative; do
+              if [[ "${{ matrix.latest }}" == "true" ]]; then
+                if [[ "${{ matrix.gpu }}" == "true" ]]; then
+                  echo "${registry}/cml:latest-gpu"
+                else
+                  echo "${registry}/cml:latest"
+                fi
+              fi
+              echo "${registry}/cml:${tag}"
+            done | head -c-1
+          )"
+          echo ::set-output name=tags::"${TAGS//$'\n'/'%0A'}"
+      - uses: docker/setup-buildx-action@v1
+      - uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key:
+            ${{ runner.os }}-buildx-${{ steps.metadata.outputs.cache_tag }}-${{
+            github.sha }}
+          restore-keys:
+            ${{ runner.os }}-buildx-${{ steps.metadata.outputs.cache_tag }}-
+      - uses: docker/login-action@v1
+        with:
+          registry: docker.io
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+      - uses: docker/build-push-action@v2
+        with:
+          push:
+            ${{ github.event_name == 'push' || github.event_name == 'schedule'
+            || github.event_name == 'workflow_dispatch' }}
+          context: ./
+          file: ./Dockerfile
+          tags: |
+            ${{ steps.metadata.outputs.tags }}
+          build-args: |
+            CML_VERSION=${{ steps.metadata.outputs.cml_version }}
+            DVC_VERSION=${{ matrix.dvc }}
+            PYTHON_VERSION=${{ matrix.python }}
+            BASE_IMAGE=${{ steps.metadata.outputs.base }}
+          pull: true
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
+      - name: Move cache
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

.github/workflows/release.yml

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+name: Release
+on:
+  workflow_dispatch:
+    inputs:
+      bump:
+        type: choice
+        required: true
+        description: Bump version number    
+        options: [major, minor, patch]
+        default: patch
+  pull_request:
+    types: [closed]
+jobs:
+  bump:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          git config --global user.name Olivaw[bot]
+          git config --global user.email [email protected]
+          git checkout -b bump/$(npm version ${{ github.event.inputs.bump }})
+          git push --set-upstream origin --follow-tags HEAD
+          gh pr create --title "Bump version to $(git describe --tags)" --fill
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+  release:
+    if: github.event.pull_request.merged && startsWith(github.head_ref, 'bump/')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: gh release create --generate-notes --draft {--target=,--title=CML\ ,}$(basename ${{ github.head_ref }})
+        env:
+          GITHUB_TOKEN: ${{ github.token }}