ci: add a hatch fmt and hatch run test workflow

We don't actually have any tests yet but still.

.github/workflows/hatch.yml

@@ -0,0 +1,29 @@
+name: hatch
+on: [push, pull_request]
+
+env:
+  UBUNTU_PACKAGES: python3-pip python3-gi
+  PIP_PACKAGES: hatch
+
+jobs:
+  hatch-fmt:
+    name: hatch
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: linuxwacom/libwacom/.github/actions/pkginstall@master
+        with:
+          apt: $UBUNTU_PACKAGES
+          pip: $PIP_PACKAGES
+      - run: hatch fmt --check
+
+  hatch-test:
+    name: hatch
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: linuxwacom/libwacom/.github/actions/pkginstall@master
+        with:
+          apt: $UBUNTU_PACKAGES
+          pip: $PIP_PACKAGES
+      - run: hatch run test