chore: dynamic preview releases (#14114)

.changeset/config.json

@@ -4,7 +4,7 @@
   "commit": false,
   "linked": [],
   "access": "public",
-  "baseBranch": "main",
+  "baseBranch": "origin/main",
   "updateInternalDependencies": "patch",
   "___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH": {
     "onlyUpdatePeerDependentsWhenOutOfRange": true

.github/workflows/preview-release-test.yml

@@ -0,0 +1,105 @@
+name: Preview release test
+
+on:
+  pull_request:
+    branches: [main]
+    types: [labeled]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  actions: write
+
+env:
+  TURBO_TOKEN: ${{ secrets.TURBO_TOKEN }}
+  TURBO_TEAM: ${{ secrets.TURBO_TEAM }}
+  FORCE_COLOR: true
+  ASTRO_TELEMETRY_DISABLED: true
+  # 7 GiB by default on GitHub, setting to 6 GiB
+  # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
+  NODE_OPTIONS: --max-old-space-size=6144
+
+jobs:
+  preview:
+    if: ${{ github.repository_owner == 'withastro' && github.event.label.name == 'markdown' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+      issues: write
+      pull-requests: write
+    name: Publish preview release
+    timeout-minutes: 5
+    steps:
+      - name: Disable git crlf
+        run: git config --global core.autocrlf false
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      # Changeset needs access to the main branch to find pending changesets
+      - name: Checkout base ref
+        run: git fetch origin ${{ github.base_ref }} && git checkout ${{ github.base_ref }}
+
+      - name: Checkout head ref
+        run: git fetch origin ${{ github.head_ref }} && git checkout ${{ github.head_ref }}
+
+      - name: Setup PNPM
+        uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
+
+      - name: Setup Node
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: 22
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build Packages
+        run: pnpm run build
+
+      - name: Get changeset status
+        id: changeset-status
+        run: |
+          pnpm changeset status --output changes.json
+          echo "changes-output=$(cat changes.json | jq -c .)" >> $GITHUB_OUTPUT
+
+      - name: Get pnpm packages
+        id: pnpm-packages
+        run: |
+          pnpm list --recursive --depth -1 --json >> pnpm.json
+          echo "packages-output=$(cat pnpm.json | jq -c .)" >> $GITHUB_OUTPUT
+
+      - name: Compute affected packages
+        id: compute-affected-packages
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        env:
+          CHANGES: ${{ steps.changeset-status.outputs.changes-output }}
+          PACKAGES: ${{ steps.pnpm-packages.outputs.packages-output }}
+        with:
+          script: |
+              const { relative } = require('node:path');
+              const changes = JSON.parse(process.env.CHANGES);
+              const packages = JSON.parse(process.env.PACKAGES);
+              const packagesMap = Object.fromEntries(packages.map(p => [p.name, relative(process.cwd(), p.path)]));
+              const affectedPackages = [...new Set(changes.changesets.map(c => c.releases.map(r=> packagesMap[r.name])).flat())]
+              core.setOutput('affected-packages', JSON.stringify(affectedPackages));
+
+      - name: Remove Preview Label
+        uses: actions-ecosystem/action-remove-labels@2ce5d41b4b6aa8503e285553f75ed56e0a40bae0 # v1.3.0
+        with:
+          labels: "markdown"
+
+      - name: Publish packages
+        env:
+          AFFECTED_PACKAGES: ${{ steps.compute-affected-packages.outputs.affected-packages }}
+        run: |
+          packages=$(echo $AFFECTED_PACKAGES | jq -r '.[]' | tr '\n' ' ')
+          if [ -n "$packages" ]; then
+            pnpm dlx pkg-pr-new publish --pnpm --compact --no-template $packages
+          else
+            echo "No affected packages to publish"
+          fi

CONTRIBUTING.md

@@ -285,7 +285,7 @@ Assigning labels isn't always easy and many times the distinction between the di
 
 ### Preview releases
 
-You can trigger a preview release **from a PR** anytime by using the label `pr preview`. Add this label, and a workflow will trigger, which at the end will add a comment with the instructions of how to install the preview release.
+You can trigger a preview release **from a PR** anytime by using the label `pr preview`. Add this label, and a workflow will trigger, which at the end will add a comment with the instructions of how to install the preview release. A preview release will be created for each package that has a pending changeset.
 
 If you're in need to trigger multiple preview releases from the same PR, remove the label and add it again.