Add workflow

Author: perkss

.github/workflows/clojure.yml

@@ -12,7 +12,16 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+    - name: Set up JDK 11
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: '11'
+    - name: Install Leiningen
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y leiningen
     - name: Install dependencies
       run: lein deps
     - name: Run tests