[CI] Add new github commands for quarantining/disabling tests

.github/workflows/README.md

@@ -0,0 +1,101 @@
+# GitHub Workflows
+
+## Quarantine/Disable Test Workflow
+
+The `quarantine-test.yml` workflow allows repository maintainers to quarantine, unquarantine, disable, or enable tests directly from issue or PR comments.
+
+### Commands
+
+| Command | Description | Attribute Used |
+|---------|-------------|----------------|
+| `/quarantine-test` | Mark test(s) as quarantined (flaky) | `[QuarantinedTest]` |
+| `/unquarantine-test` | Remove quarantine from test(s) | Removes `[QuarantinedTest]` |
+| `/disable-test` | Disable test(s) due to an active issue | `[ActiveIssue]` |
+| `/enable-test` | Re-enable previously disabled test(s) | Removes `[ActiveIssue]` |
+
+### Syntax
+
+```
+/quarantine-test <test-name(s)> <issue-url> [--target-pr <pr-url>]
+/unquarantine-test <test-name(s)> [--target-pr <pr-url>]
+/disable-test <test-name(s)> <issue-url> [--target-pr <pr-url>]
+/enable-test <test-name(s)> [--target-pr <pr-url>]
+```
+
+### Parameters
+
+| Parameter | Required | Description |
+|-----------|----------|-------------|
+| `<test-name(s)>` | Yes | One or more test method names (space-separated) |
+| `<issue-url>` | For quarantine/disable | URL of the GitHub issue tracking the problem |
+| `--target-pr <pr-url>` | No | Push changes to an existing PR instead of creating a new one |
+
+### Examples
+
+#### Quarantine a flaky test (creates new PR)
+```
+/quarantine-test MyTestClass.MyTestMethod https://github.com/dotnet/aspire/issues/1234
+```
+
+#### Quarantine multiple tests
+```
+/quarantine-test TestMethod1 TestMethod2 TestMethod3 https://github.com/dotnet/aspire/issues/1234
+```
+
+#### Quarantine a test and push to an existing PR
+```
+/quarantine-test MyTestMethod https://github.com/dotnet/aspire/issues/1234 --target-pr https://github.com/dotnet/aspire/pull/5678
+```
+
+#### Unquarantine a test (creates new PR)
+```
+/unquarantine-test MyTestClass.MyTestMethod
+```
+
+#### Unquarantine and push to an existing PR
+```
+/unquarantine-test MyTestMethod --target-pr https://github.com/dotnet/aspire/pull/5678
+```
+
+#### Disable a test due to an active issue
+```
+/disable-test MyTestMethod https://github.com/dotnet/aspire/issues/1234
+```
+
+#### Enable a previously disabled test
+```
+/enable-test MyTestMethod
+```
+
+#### Comment on a PR to push changes to that PR
+When you comment on a PR (not an issue), the workflow will automatically push changes to that PR's branch instead of creating a new PR. You can override this by specifying `--target-pr`.
+
+### Behavior
+
+1. **Permission Check**: Only users with write access to the repository can use these commands.
+2. **Processing Indicator**: The workflow adds an 👀 reaction to your comment when it starts processing.
+3. **Status Comments**: The workflow posts comments to indicate:
+   - ⏳ Processing started
+   - ✅ Success (with link to created/updated PR)
+   - ℹ️ No changes needed (test already in desired state)
+   - ❌ Failure (with error details)
+
+### Target PR Behavior
+
+| Context | `--target-pr` specified | Result |
+|---------|-------------------------|--------|
+| Comment on Issue | No | Creates new PR from `main` |
+| Comment on Issue | Yes | Pushes to specified PR |
+| Comment on PR | No | Pushes to that PR's branch |
+| Comment on PR | Yes | Pushes to specified PR (overrides) |
+
+### Restrictions
+
+- The `--target-pr` URL must be from the same repository
+- Cannot push to PRs from forks
+- Cannot push to closed PRs
+- The PR branch must not be protected in a way that prevents pushes
+
+### Concurrency
+
+The workflow uses concurrency groups based on the issue/PR number to prevent race conditions when multiple commands are issued on the same issue.