Add GitHub Actions workflow for Clojure CI (#30)

* Add GitHub Actions workflow for Clojure CI

- Test with Java 11, 17, and 24
- Use setup-java and setup-clojure actions
- Cache Maven dependencies for faster builds

Author: danielcompton

.github/workflows/clojure.yml

@@ -0,0 +1,40 @@
+name: Clojure CI
+
+on:
+  push:
+    branches: [ master, main ]
+  pull_request:
+    branches: [ master, main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        java: [11, 17, 24]
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Java ${{ matrix.java }}
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: ${{ matrix.java }}
+    
+    - name: Setup Clojure
+      uses: DeLaGuardo/[email protected]
+      with:
+        lein: latest
+    
+    - name: Cache dependencies
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/project.clj') }}
+        restore-keys: |
+          ${{ runner.os }}-m2-
+    
+    - name: Run tests
+      run: lein test