Add fork guard to extension-template-sync workflow

[Copilot]

The extension-template-sync Copilot agent workflow was running in forked repositories, which is undesirable.

Change

Added if: github.repository == 'microsoft/vscode-isort' to the frontmatter of .github/workflows/extension-template-sync.md, between the on: block and permissions::

on:
  schedule:
    - cron: daily
  workflow_dispatch:
if: github.repository == 'microsoft/vscode-isort'
permissions:
  ...

Original prompt

Add if: github.repository == 'microsoft/vscode-isort' to the frontmatter of .github/workflows/extension-template-sync.md so the workflow does not run in forked repositories.

Add the if: line right after the on: block and before permissions: in the YAML frontmatter.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: How do i make this workflow not run in forks ?

Assistant: This is a Copilot coding agent workflow (.md file), not a standard GitHub Actions YAML workflow. To prevent it from running in forks, add an if condition to the frontmatter using the github.repository context variable:

on:
  schedule:
    - cron: daily
  workflow_dispatch:
if: github.repository == 'microsoft/vscode-isort'

Add the if: line right after the on: block (and before permissions:). This ensures the workflow only executes when the repository is the original microsoft/vscode-isort and not any fork of it.

User: Can you create a PR on microsoft/vscode-isort, microsoft/vscode-pylint, microsoft/vscode-mypy, microsoft/vscode-flake8 and microsoft/vscode-black-formatter ?

Assistant: I'll create PRs on all 5 repositories to add the fork guard to the extension-template-sync.md workflow.

Assistant: I've kicked off PR creation on all 5 repositories. Each will add the if: github.repository == '...' guard to .github/workflows/extension-template-sync.md:

Repository	if condition
microsoft/vscode-isort	github.repository == 'microsoft/vscode-isort'
microsoft/vscode-pylint	github.repository == 'microsoft/vscode-pylint'
microsoft/vscode-mypy	github.repository == 'microsoft/vscode-mypy'
microsoft/vscode-flake8	github.repository == 'microsoft/vscode-flake8'
microsoft/vscode-black-formatter	github.repository == 'microsoft/vscode-black-formatter'

The PRs are being prepared now — you'll see them appear shortly in each repo.

This pull request was created from Copilot chat.

[rchiodo]

Approved via Review Center.