chore: add sccache and make validation optional

.github/workflows/pull-request.yaml

@@ -2,6 +2,10 @@ name: Pull Request
 
 on: pull_request
 
+env:
+  SCCACHE_GHA_ENABLED: "true"
+  RUSTC_WRAPPER: "sccache"
+
 jobs:
   check:
     name: Check Python
@@ -13,6 +17,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+      - name: Run sccache-cache
+        uses: mozilla-actions/[email protected]
       - name: Install poetry
         run: pipx install poetry
       - name: Set up Python ${{ matrix.python-version }}
@@ -39,16 +45,8 @@ jobs:
           src: "./guppylang"
           args: check
 
-      - name: Build Hugr validator
-        uses: PyO3/maturin-action@v1
-        with:
-          command: build
-          sccache: 'true'
-          rust-toolchain: '1.75'
-          working-directory: validator
-
-      - name: Install Hugr validator
-        run: poetry add validator/target/wheels/*
+      - name: Install Guppy with validation
+        run: poetry install --with validation
 
       - name: Run tests
         run: poetry run pytest

pyproject.toml

@@ -23,6 +23,11 @@ pre-commit = "^3.6.0"
 ruff = "^0.1.11"
 maturin = "^1.4.0"
 pytket = "*"
+
+[tool.poetry.group.validation]
+optional = true
+
+[tool.poetry.group.validation.dependencies]
 guppyval = {path = "validator"}
 
 [tool.poetry.extras]