Pin GitHub Actions to full-length commit SHAs (#196)

Author: danfiedler-msft

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    groups:
+      github-actions:
+        patterns: ["*"]
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7

.github/workflows/integration-test.yml

@@ -38,7 +38,7 @@ jobs:
       # 1. Source checkout
       # -----------------------------------------------------------------------
       - name: Checkout repository (with submodules)
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
         with:
           # aiopslab-applications contains the K8s manifests and Helm charts
           # required by the orchestrator to deploy HotelReservation.
@@ -138,7 +138,7 @@ jobs:
       # 3. Python + dependencies
       # -----------------------------------------------------------------------
       - name: Set up Python 3.11
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: '3.11'
 
@@ -188,7 +188,7 @@ jobs:
 
       - name: Upload kind logs on failure
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: kind-logs
           path: /tmp/kind-logs