ci: add release workflow

.github/actions/get-prerelease/action.yml

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+name: Return a boolean indicating if the version contains prerelease identifiers
+
+inputs:
+  version:
+    required: true
+
+outputs:
+  prerelease:
+    value: ${{ steps.get_prerelease.outputs.PRERELEASE }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: get_prerelease
+      shell: bash
+      run: |
+        if [[ "${VERSION}" == *"beta"* || "${VERSION}" == *"alpha"* ]]; then
+          echo "PRERELEASE=true" >> $GITHUB_OUTPUT
+        else
+          echo "PRERELEASE=false" >> $GITHUB_OUTPUT
+        fi
+      env:
+        VERSION: ${{ inputs.version }}

.github/actions/get-release-notes/action.yml

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+name: Return the release notes extracted from the body of the PR associated with the release.
+
+inputs:
+  version:
+    required: true
+  repo_name:
+    required: false
+  repo_owner:
+    required: true
+  token:
+    required: true
+
+outputs:
+  release-notes:
+    value: ${{ steps.get_release_notes.outputs.RELEASE_NOTES }}
+
+runs:
+  using: composite
+
+  steps:
+    - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+      id: get_release_notes
+      with:
+        result-encoding: string
+        script: |
+          const { data: pulls } = await github.rest.pulls.list({
+            owner: process.env.REPO_OWNER,
+            repo: process.env.REPO_NAME,
+            state: 'all',
+            head: `${process.env.REPO_OWNER}:release/${process.env.VERSION}`,
+          });
+          core.setOutput('RELEASE_NOTES', pulls[0]?.body || '');
+      env:
+        GITHUB_TOKEN: ${{ inputs.token }}
+        REPO_OWNER: ${{ inputs.repo_owner }}
+        REPO_NAME: ${{ inputs.repo_name }}
+        VERSION: ${{ inputs.version }}

.github/actions/get-version/action.yml

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+name: Return the version extracted from the .version file
+
+outputs:
+  version:
+    value: ${{ steps.get_version.outputs.VERSION }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: get_version
+      shell: bash
+      run: |
+        VERSION=$(head -1 .version)
+        echo "VERSION=${VERSION}" >> $GITHUB_OUTPUT

.github/actions/npm-publish/action.yml

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+name: Publish release to npm
+
+inputs:
+  node-version:
+    required: true
+  version:
+    required: true
+  require-build:
+    default: true
+
+runs:
+  using: composite
+
+  steps:
+    - name: Checkout code
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+    - name: Setup Node
+      uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+      with:
+        node-version: ${{ inputs.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      shell: bash
+      run: npm ci
+
+    - name: Build package
+      if: inputs.require-build == 'true'
+      shell: bash
+      run: npm run build
+
+    - name: Publish release to npm
+      shell: bash
+      run: |
+        if [[ "${VERSION}" == *"beta"* ]]; then
+          TAG="beta"
+        elif [[ "${VERSION}" == *"alpha"* ]]; then
+          TAG="alpha"
+        else
+          TAG="latest"
+        fi
+        npm publish --provenance --tag $TAG
+      env:
+        VERSION: ${{ inputs.version }}

.github/actions/release-create/action.yml

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+name: Create a GitHub release
+
+#
+# Creates a GitHub release with the given version.
+#
+# TODO: Remove once the common repo is public.
+#
+
+inputs:
+  token:
+    required: true
+  name:
+    required: true
+  body:
+    required: true
+  tag:
+    required: true
+  commit:
+    required: true
+  draft:
+    default: false
+    required: false
+  prerelease:
+    default: false
+    required: false
+
+runs:
+  using: composite
+
+  steps:
+    - uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844 # v2.0.4
+      with:
+        body: ${{ inputs.body }}
+        name: ${{ inputs.name }}
+        tag_name: ${{ inputs.tag }}
+        target_commitish: ${{ inputs.commit }}
+        draft: ${{ inputs.draft }}
+        prerelease: ${{ inputs.prerelease }}
+      env:
+        GITHUB_TOKEN: ${{ inputs.token }}

.github/actions/tag-exists/action.yml

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+name: Return a boolean indicating if a tag already exists for the repository
+
+inputs:
+  token:
+    required: true
+  tag:
+    required: true
+
+outputs:
+  exists:
+    description: 'Whether the tag exists or not'
+    value: ${{ steps.tag-exists.outputs.EXISTS }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: tag-exists
+      shell: bash
+      run: |
+        GET_API_URL="https://api.github.com/repos/${GITHUB_REPOSITORY}/git/ref/tags/${TAG_NAME}"
+        http_status_code=$(curl -LI $GET_API_URL -o /dev/null -w '%{http_code}\n' -s -H "Authorization: token ${GITHUB_TOKEN}")
+        if [ "$http_status_code" -ne "404" ] ; then
+          echo "EXISTS=true" >> $GITHUB_OUTPUT
+        else
+          echo "EXISTS=false" >> $GITHUB_OUTPUT
+        fi
+      env:
+        TAG_NAME: ${{ inputs.tag }}
+        GITHUB_TOKEN: ${{ inputs.token }}

.github/workflows/release.yml

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+name: Create npm and GitHub Release
+
+on:
+  pull_request:
+    types:
+      - closed
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  id-token: write # For publishing to npm using --provenance
+
+jobs:
+  release:
+    if: github.event_name == 'workflow_dispatch' || (github.event_name == 'pull_request' && github.event.pull_request.merged && startsWith(github.event.pull_request.head.ref, 'release/'))
+    runs-on: ubuntu-latest
+    environment: release
+
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+
+      - id: get_version
+        uses: ./.github/actions/get-version
+
+      - id: get_prerelease
+        uses: ./.github/actions/get-prerelease
+        with:
+          version: ${{ steps.get_version.outputs.version }}
+
+      - id: get_release_notes
+        uses: ./.github/actions/get-release-notes
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: ${{ steps.get_version.outputs.version }}
+          repo_owner: ${{ github.repository_owner }}
+          repo_name: ${{ github.event.repository.name }}
+
+      - id: tag_exists
+        uses: ./.github/actions/tag-exists
+        with:
+          tag: ${{ steps.get_version.outputs.version }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - if: steps.tag_exists.outputs.exists == 'true'
+        run: exit 1
+
+      - uses: ./.github/actions/npm-publish
+        with:
+          node-version: 24
+          require-build: true
+          version: ${{ steps.get_version.outputs.version }}
+
+      - uses: ./.github/actions/release-create
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          name: v${{ steps.get_version.outputs.version }}
+          body: ${{ steps.get_release_notes.outputs.release-notes }}
+          tag: v${{ steps.get_version.outputs.version }}
+          commit: ${{ github.sha }}
+          prerelease: ${{ steps.get_prerelease.outputs.prerelease }}