fix: Feature matrix (#814)

* feat: Add workflow to run Go program and create PR

Introduces a GitHub Actions workflow that checks out two repositories, sets up Go, installs dependencies, runs a Go program, and creates a pull request with generated documentation updates.

* fix: Update workflow name and trigger

Renamed the workflow to 'Feature Matrix Creator' and changed the trigger from push on main to manual workflow_dispatch.

* feat: Add feature-matrix tool for ADK feature extraction

Introduces a new tool under tools/feature-matrix to generate a feature support matrix for ADK runtimes by analyzing documentation. Includes Go implementation (main.go), prompt and starter markdown files, and Go module dependencies.

* feat: Update feature matrix workflow to use local tool

Removes checkout of the adk-docs-features repo and updates steps to use the local tools/feature-matrix directory for dependency installation and program execution. Simplifies the workflow by eliminating unnecessary repository cloning and file movement.

* fix: Update feature matrix prompt and matrix content

Revised the prompt to use 'Unsupported' instead of 'Planned' for features not supported, clarified disclaimer placement, and updated instructions for matrix ordering. Updated start.md to move the disclaimer and feature matrix to the top, reflect new terminology, and provide a more accurate and current feature support matrix.

* fix: Update workflow for feature matrix PRs

Adds write permissions for contents and pull-requests to the workflow. Updates pull request commit message, title, body, and branch name to reflect feature matrix updates instead of documentation.

* fix: Update workflow name and PR token in feature matrix

Renamed the workflow to 'Publish Feature Matrix' and switched the pull request token from GITHUB_TOKEN to ADK_BOT_GITHUB_TOKEN for improved automation and permissions.

Author: tpryan

.github/workflows/feature-matrix-updater.yaml

@@ -1,4 +1,4 @@
-name: Feature Matrix Creator
+name: Publish Feature Matrix
 on:
   workflow_dispatch:
 jobs:
@@ -29,7 +29,7 @@ jobs:
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@v6
       with:
-        token: ${{ secrets.GITHUB_TOKEN }}
+        token: ${{ secrets.ADK_BOT_GITHUB_TOKEN }}
         commit-message: "feat: propose update to feature matrix"
         title: "Proposed Update to Feature Matrix"
         body: "This is an auto-generated PR with new content for the feature matrix."