feat: add workflow to auto-update CLI version via repository_dispatch

[jonathannorris]

Summary

• Adds update-cli-version.yml workflow that receives repository_dispatch events from the CLI release workflow
• Updates the @devcycle/cli version in src/action.ts, rebuilds dist/, and opens a PR automatically

[Copilot]

Pull request overview

Adds an automation workflow that listens for repository_dispatch events and opens a PR to bump the @devcycle/cli version used by this GitHub Action (including rebuilding dist/).

Changes:

• Introduces .github/workflows/update-cli-version.yml triggered by repository_dispatch (update-cli-version).
• Updates src/action.ts based on the dispatched version, rebuilds the project, and pushes a branch.
• Creates a pull request automatically via gh pr create.

Comments suppressed due to low confidence (1)

.github/workflows/update-cli-version.yml:65

• gh pr create will fail if a PR for the same branch already exists (common when retrying jobs or when a previous run partially succeeded). To make this workflow retry-safe, detect an existing PR for $BRANCH_NAME and either update it (push changes + gh pr edit) or skip creation when one is already open.

              env:
                  GH_TOKEN: ${{ secrets.AUTOMATION_USER_TOKEN }}
              run: |
                  gh pr create \
                    --base main \
                    --head "$BRANCH_NAME" \
                    --title "chore: update CLI version to ${CLI_VERSION}" \
                    --body "This PR was automatically created by the DevCycle CLI release workflow."

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