feat: Add promtool testing in Makefile (#132)

* Fix file name used in lsi sas alert rule test.
* Add promtool job in GH check workflow.
* Ensure func depends on lint-unit and promtool.

.github/workflows/check.yaml

@@ -19,10 +19,25 @@ jobs:
     with:
       python-version: ${{ matrix.python-version }}
       tox-version: "<4"
+
+  promtool:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+      # prometheus snap comes pre-packaged with promtool
+      - name: Install prometheus snap
+        run: sudo snap install prometheus
+      - name: Check validity of prometheus alert rules
+        run: |
+          promtool check rules src/prometheus_alert_rules/*.yaml
+      - name: Run unit tests for prometheus alert rules 
+        run: |
+          promtool test rules tests/unit/test_alert_rules/*.yaml
 
   func:
     uses: canonical/bootstack-actions/.github/workflows/func.yaml@v2
-    needs: lint-unit
+    needs: [lint-unit, promtool]
     strategy:
       fail-fast: false
       matrix:

tests/unit/test_alert_rules/test_lsi_sas.yaml

@@ -1,5 +1,5 @@
 rule_files:
-  - ../../../src/prometheus_alert_rules/lsi_sas_2.yaml
+  - ../../../src/prometheus_alert_rules/lsi_sas.yaml
 
 evaluation_interval: 1m