feat: add letta-code-action workflow (#428)

Co-authored-by: Letta <noreply@letta.com>

.github/workflows/letta.yml

@@ -0,0 +1,24 @@
+name: Letta Code
+on:
+  issue_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review_comment:
+    types: [created]
+
+jobs:
+  letta:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+      - uses: letta-ai/letta-code-action@v0
+        with:
+          letta_api_key: ${{ secrets.LETTA_API_KEY }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}