ci: add tests workflow

.github/workflows/tests.yml

@@ -0,0 +1,68 @@
+name: Tests
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        # add any other Typst versions that your package should support
+        typst-version: ["0.11"]
+        # the docs don't need to build with all versions supported by the package;
+        # the latest one is enough
+        include:
+          - typst-version: "0.11"
+            doc: 1
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Probe runner package cache
+        uses: awalsh128/cache-apt-pkgs-action@v1
+        with:
+          packages: imagemagick cargo
+          version: 1.0
+
+      - name: Install oxipng from crates.io
+        uses: baptiste0928/cargo-install@v3
+        with:
+          crate: oxipng
+
+      - name: Install just from crates.io
+        uses: baptiste0928/cargo-install@v3
+        with:
+          crate: just
+
+      - name: Install typst-test from github
+        uses: baptiste0928/cargo-install@v3
+        with:
+          crate: typst-test
+          git: https://github.com/tingerrr/typst-test.git
+          tag: ci-semi-stable
+
+      - name: Setup typst
+        uses: typst-community/setup-typst@v3
+        with:
+          typst-version: ${{ matrix.typst-version }}
+
+      - name: Run test suite
+        run: just test
+
+      - name: Archive diffs
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: diffs
+          path: |
+            tests/**/diff/*.png
+            tests/**/out/*.png
+            tests/**/ref/*.png
+          retention-days: 5
+
+      - name: Build docs
+        if: ${{ matrix.doc }}
+        run: just doc