Merge new AI prompt for bundling dependency update PRs

Author: AArnott

.github/skills/bundle-dependency-prs/SKILL.md

@@ -0,0 +1,42 @@
+---
+name: bundle-dependency-prs
+description: Fix broken dependency update PRs and aggregate the ones that work into one PR.
+disable-model-invocation: true
+---
+
+# Instructions
+
+You have two goals:
+
+1. Get all dependency PRs to a state where their PR checks pass.
+2. Aggregate dependency PRs with passing checks into just one PR.
+
+You can identify dependency update PRs by those authored by `dependabot` or `renovate`.
+
+You'll find instructions for building and validating the repo in the [CONTRIBUTING.md](../../../CONTRIBUTING.md) doc.
+Always validate your changes locally before pushing them to the remote repository.
+
+When writing PR bodies or comments, avoid unmatched markdown code fences. Keep markdown well-formed.
+
+## Fix up dependency PRs with failing checks
+
+Before aggregating PRs, first try to fix any individual dependency update PRs with failing build/test checks.
+
+1. For the dependency PRs with failing build or test PR checks, check out their source branch and fix any issues.
+2. Push your fixes as fresh commits to the individual dependency PRs.
+3. If you can't fix a particular PR, add a comment to the PR describing your attempt and outcome.
+
+## Group dependency PRs that are ready to go
+
+Your next goal is to collect all the dependency updates that are ready to go into a single PR.
+
+1. Prepare a local branch called `bulkDepUpdates`.
+   1. Consider that a remote branch by the same name may already exist. If it does, base your local branch on it.
+   2. Merge `origin/main` into this branch.
+   3. Resolve any conflicts.
+2. For the dependency PRs whose build and test PR checks already pass, merge them into the `bulkDepUpdates` branch.
+   Consider that your local branch may have already merged an equivalent PR in the past (from a past run). If so, you should skip merging that PR.
+   Resolve any conflicts.
+   Build and run tests to validate your branch.
+3. Push the branch.
+4. Create a PR, if one does not already exist.

CONTRIBUTING.md

@@ -42,7 +42,11 @@ This repository can be built on Windows, Linux, and OSX.
 
 Building, testing, and packing this repository can be done by using the standard dotnet CLI commands (e.g. `dotnet build`, `dotnet test`, `dotnet pack`, etc.).
 
-[pwsh]: https://learn.microsoft.com/powershell/scripting/install/installing-powershell
+## Testing
+
+You can use `dotnet test` to build and/or test the repo.
+
+There may be tests that are known to be unstable or have special requirements. These can be avoided by running tests using the [dotnet-test-cloud.ps1](tools/dotnet-test-cloud.ps1) script *after* running `dotnet build`.
 
 ## Releases
 
@@ -99,3 +103,5 @@ git checkout origin/main
 # resolve any conflicts, then commit the merge commit.
 git push origin -u HEAD
 ```
+
+[pwsh]: https://learn.microsoft.com/powershell/scripting/install/installing-powershell