Add GitHub Actions workflow for syncing stacktodate config

Add a new workflow that runs on push to main/master branches to:
- Build the stacktodate CLI
- Verify the stacktodate.yml configuration matches detected versions
- Push the configuration to the remote API for tracking

This ensures the tech stack configuration stays synchronized and
valid as part of the CI/CD pipeline.

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <[email protected]>

Author: ceritium

.github/workflows/sync-stacktodate.yml

@@ -0,0 +1,30 @@
+name: Sync Stack To Date
+
+on:
+  push:
+    branches: [ master, main ]
+
+jobs:
+  sync-stacktodate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.25'
+
+      - name: Download dependencies
+        run: go mod download
+
+      - name: Build stacktodate
+        run: go build -o stacktodate
+
+      - name: Check stacktodate config
+        run: ./stacktodate check
+
+      - name: Push stacktodate config
+        run: ./stacktodate push
+        env:
+          STD_TOKEN: ${{ secrets.STD_TOKEN }}