Add multiple python versions to CI.

Author: nzlosh

.github/workflows/ci.yaml

@@ -19,19 +19,22 @@ jobs:
 
   lint-checks:
     needs: pre_job
-    name: Make requirements and lint check on Python3.10
+    name: Make requirements and lint checks
     runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
     steps:
       - name: Checkout st2tests repository
         uses: actions/checkout@v2
       - name: Checkout st2 repository
         uses: actions/checkout@v2
         with:
           repository: "StackStorm/st2"
-      - name: Set up Python3.10
+      - name: "Set up Python ${{ matrix.python-version }}"
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10.12'
+          python-version: "${{ matrix.python-version }}"
       - name: Install apt dependencies
         run: |
           sudo apt install -y libldap2-dev libsasl2-dev