github: Add GUT tests job

Rename the pre-commit workflow to the more generic "checks" and add a
job to run GUT. This makes use of the chickensoft-games/setup-godot
action to download and cache Godot for Linux.

Author: dbnicholson

.github/workflows/pre-commit.yaml renamed to .github/workflows/checks.yaml

@@ -1,4 +1,4 @@
-name: pre-commit
+name: Checks
 
 on:
   pull_request:
@@ -8,6 +8,7 @@ on:
 
 jobs:
   pre-commit:
+    name: Linting and Formatting
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -19,3 +20,18 @@ jobs:
         path: ~/.cache/pre-commit
         key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
     - uses: pre-commit/[email protected]
+
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Setup Godot
+      uses: chickensoft-games/[email protected]
+      with:
+        version: 4.2.2
+        use-dotnet: false
+    - name: Run tests
+      run: |
+        godot --path . --headless --script addons/gut/gut_cmdln.gd -gexit