publish template on publishing release (#45327)

Summary:
Call the react-native-community/template GHA to trigger a new release when we publish a react-native release. This then waits to confirm that the package is published.

See react-native-community/template#36 for the matching change

Changelog: [General][Added] trigger template publish

Pull Request resolved: https://github.com/facebook/react-native/pull/45327

Test Plan: Not sure on the best way forward here.

Reviewed By: cipolleschi

Differential Revision: D59467829

Pulled By: blakef

fbshipit-source-id: 091269e7ecdae5801ac7c03a1ede54452ae99b24

.github/workflows/publish-release.yml

@@ -423,6 +423,48 @@ jobs:
         with:
           name: react-native-package
           path: build
+      - name: Publish @react-native-community/template
+        if: needs.set_release_type.outputs.RELEASE_TYPE == 'release'
+        id: publish-to-npm
+        run: |
+          COMMIT_MSG=$(git log -n1 --pretty=%B);
+          if grep -q '#publish-packages-to-npm&latest' <<< "$COMMIT_MSG"; then
+            echo "TAG=latest" >> $GITHUB_OUTPUT
+            IS_LATEST=true
+          else
+            IS_LATEST=false
+          fi
+          # Go from v0.75.0-rc.4 -> 0.75-stable, which is the template's branching scheme
+          VERSION=$(grep -oE '\d+\.\d+' <<< "${{ github.ref_name }}" | { read version; echo "$version-stable" })
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
+
+          curl -L -X POST https://api.github.com/repos/react-native-community/template/release.yaml/dispatches \
+            -H "Accept: application/vnd.github.v3+json" \
+            -H "Authorization: Bearer $REACT_NATIVE_BOT_GITHUB_TOKEN" \
+            -d "{\"ref\":\"$VERSION\",\"inputs\":{\"version\":\"${{ github.ref_name }}\",\"is_latest_on_npm\":\"$IS_LATEST\"}}\n"
+      - name: Wait for template to be published
+        if: needs.set_release_type.outputs.RELEASE_TYPE == 'release'
+        timeout-minutes: 3
+        env:
+          VERSION: ${{ steps.publish-to-npm.outputs.VERSION }}
+          TAG: ${{ steps.publish-to-npm.outputs.TAG }}
+        run: |
+          echo "Waiting until @react-native-community/template is published to npm"
+          while true; do
+            if curl -o /dev/null -s -f "https://registry.npmjs.org/@react-native-community/template/$VERSION"; then
+              echo "Confirm that @react-native-community/template@$VERSION is published on npm"
+              break
+            fi
+            sleep 10
+          done
+          while [ "$TAG" == "latest" ]; do
+            CURRENT=$(curl -s "https://registry.npmjs.org/react-native/latest" | jq -r '.version');
+            if [ "$CURRENT" == "$VERSION" ]; then
+              echo "Confirm that @react-native-community/template@latest == $VERSION on npm"
+              break
+            fi
+            sleep 10
+          done
       - name: Update rn-diff-purge to generate upgrade-support diff
         if: needs.set_release_type.outputs.RELEASE_TYPE == 'release'
         run: |