Add pre-commit code checks

.github/workflows/codechecks.yaml

@@ -0,0 +1,57 @@
+name: Code checks
+
+on:
+  pull_request:
+  push:
+    branches: ["main"]
+
+jobs:
+
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
+
+  explicit-imports:
+    runs-on: ubuntu-latest
+    name: "ExplicitImports.jl"
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: '1'
+      - uses: julia-actions/cache@v2
+      - uses: julia-actions/julia-buildpkg@v1
+      - name: Install dependencies
+        shell: julia {0}
+        run: |
+          # Add ExplicitImports.jl and packages that Thunderbolt has extensions for
+          using Pkg
+          Pkg.add([
+            PackageSpec(name = "ExplicitImports", version = "1.6"),
+            # PackageSpec(name = "Metis"),
+            # PackageSpec(name = "BlockArrays"),
+          ])
+      - name: ExplicitImports.jl code checks
+        shell: julia --project {0}
+        run: |
+          using Thunderbolt, ExplicitImports
+          # Check Thundebolt
+          allow_unanalyzable = (,) # baremodules
+          check_no_implicit_imports(Thunderbolt; allow_unanalyzable)
+          check_no_stale_explicit_imports(Thunderbolt; allow_unanalyzable)
+          check_all_qualified_accesses_via_owners(Thunderbolt)
+          check_no_self_qualified_accesses(Thunderbolt)
+          # Check extension modules
+          # for ext in (:ThunderboltBlockArrays, :ThunderboltMetis)
+          #     extmod = Base.get_extension(Thunderbolt, ext)
+          #     if extmod !== nothing
+          #         check_no_implicit_imports(extmod)
+          #         check_no_stale_explicit_imports(extmod)
+          #         check_all_qualified_accesses_via_owners(extmod)
+          #         check_no_self_qualified_accesses(extmod)
+          #     else
+          #         @warn "$(ext) extensions not available."
+          #     end
+          # end