Squashed 'bip-0352/secp256k1lab/' content from commit 44dc4bd

git-subtree-dir: bip-0352/secp256k1lab
git-subtree-split: 44dc4bd893b8f03e621585e3bf255253e0e0fbfb

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+name: Tests
+on: [push, pull_request]
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v5
+      - run: uvx ruff check .
+  mypy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v5
+      - run: uvx mypy .