ci: add a clj-kondo gate and cover the declared Clojure versions

Nothing enforced static analysis, though sources enable *warn-on-reflection*
and CONTRIBUTING asks for a clean check. Lint runs at --fail-level error.

Where deps.edn declared a :1.10 alias the matrix never ran, the version is
now exercised; advertised support is otherwise untestable.

Author: jsavyasachi

.github/workflows/test.yml

@@ -9,13 +9,22 @@ permissions:
   contents: read
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeLaGuardo/setup-clojure@13.6.1
+        with:
+          clj-kondo: latest
+      - run: clj-kondo --lint src test
+
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         jdk: ['17', '21']
-        clojure: ['1.11', '1.12']
+        clojure: ['1.10', '1.11', '1.12']
     name: jdk ${{ matrix.jdk }} / clojure ${{ matrix.clojure }}
     steps:
       - uses: actions/checkout@v4