Setup releaser (#88)

.github/workflows/enforce-labels.yml

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+name: Enforce PR label
+
+on:
+  pull_request:
+    types: [labeled, unlabeled, opened, edited, synchronize]
+jobs:
+  enforce-label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: enforce-triage-label
+        uses: jupyterlab/maintainer-tools/.github/actions/enforce-label@v1

.github/workflows/prep-release.yml

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+name: 'Step 1: Prep Release'
+on:
+  workflow_dispatch:
+    inputs:
+      version_spec:
+        description: 'New Version Specifier'
+        default: 'next'
+        required: false
+      branch:
+        description: 'The branch to target'
+        default: 'main'
+        required: false
+      post_version_spec:
+        description: 'Post Version Specifier'
+        required: false
+      since:
+        description: 'Use PRs with activity since this date or git reference'
+        required: false
+      since_last_stable:
+        description: 'Use PRs with activity since the last stable git tag'
+        required: false
+        type: boolean
+jobs:
+  prep_release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+
+      - name: Prep Release
+        id: prep-release
+        uses: jupyter-server/jupyter_releaser/.github/actions/prep-release@v2
+        with:
+          token: ${{ secrets.ADMIN_GITHUB_TOKEN }}
+          version_spec: ${{ github.event.inputs.version_spec }}
+          post_version_spec: ${{ github.event.inputs.post_version_spec }}
+          target: ${{ github.event.inputs.target }}
+          branch: ${{ github.event.inputs.branch }}
+          since: ${{ github.event.inputs.since }}
+          since_last_stable: ${{ github.event.inputs.since_last_stable }}
+
+      - name: '** Next Step **'
+        run: |
+          echo "Optional): Review Draft Release: ${{ steps.prep-release.outputs.release_url }}"

.github/workflows/publish-release.yml

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+name: 'Step 2: Publish Release'
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: 'The target branch'
+        default: 'main'
+        required: false
+      release_url:
+        description: 'The URL of the draft GitHub release'
+        required: false
+      steps_to_skip:
+        description: 'Comma separated list of steps to skip'
+        required: false
+
+jobs:
+  publish_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Conda environment with Micromamba
+        uses: mamba-org/provision-with-micromamba@main
+        with:
+          environment-name: ci-env
+          environment-file: ci_env.yml
+          channels: conda-forge
+
+      - name: Populate Release
+        id: populate-release
+        uses: jupyter-server/jupyter_releaser/.github/actions/populate-release@v2
+        with:
+          token: ${{ secrets.ADMIN_GITHUB_TOKEN }}
+          target: ${{ github.event.inputs.target }}
+          branch: ${{ github.event.inputs.branch }}
+          release_url: ${{ github.event.inputs.release_url }}
+          steps_to_skip: ${{ github.event.inputs.steps_to_skip }}
+
+      - name: Finalize Release
+        id: finalize-release
+        env:
+          PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
+          TWINE_USERNAME: __token__
+        uses: jupyter-server/jupyter-releaser/.github/actions/finalize-release@v2
+        with:
+          token: ${{ secrets.ADMIN_GITHUB_TOKEN }}
+          target: ${{ github.event.inputs.target }}
+          release_url: ${{ steps.populate-release.outputs.release_url }}
+
+      - name: '** Next Step **'
+        if: ${{ success() }}
+        run: |
+          echo "Verify the final release"
+          echo ${{ steps.finalize-release.outputs.release_url }}
+
+      - name: '** Failure Message **'
+        if: ${{ failure() }}
+        run: |
+          echo "Failed to Publish the Draft Release Url:"
+          echo ${{ steps.populate-release.outputs.release_url }}