ci: Filter supported versions of AKS

Whenever AKS stopped supporting a particular version of AKS, we had to
manually remove it from all stable branches. Now instead of that, we
will dynamically check if it's supported and only then run the test.

Signed-off-by: Marcel Zieba <marcel.zieba@isovalent.com>

.github/workflows/conformance-aks.yaml

@@ -97,7 +97,6 @@ jobs:
           yq -o=json "${work_dir}/k8s-versions.yaml" | jq . > "${destination_directory}/azure.json"
 
       - name: Generate Matrix
-        id: set-matrix
         run: |
           cd /tmp/generated/azure
 
@@ -112,7 +111,31 @@ jobs:
 
           echo "Generated matrix:"
           cat /tmp/matrix.json
-          echo "matrix=$(jq -c . < /tmp/matrix.json)" >> $GITHUB_OUTPUT
+
+      - name: Login to Azure
+        uses: azure/login@6b2456866fc08b011acb422a92a4aa20e2c4de32 # v2.1.0
+        with:
+          creds: ${{ secrets.AZURE_PR_SP_CREDS }}
+
+      - name: Filter Matrix
+        id: set-matrix
+        run: |
+          cp /tmp/matrix.json /tmp/result.json
+          jq -c '.include[]' /tmp/matrix.json | while read i; do
+            VERSION=$(echo $i | jq -r '.version')
+            LOCATION=$(echo $i | jq -r '.location')
+            az aks get-versions --location $LOCATION > /tmp/output
+            if grep -q -F $VERSION /tmp/output; then
+              echo "Version $VERSION is valid for location $LOCATION"
+            else
+              echo "Removing version $VERSION as it's not valid for location $LOCATION"
+              jq 'del(.include[] | select(.version == "'$VERSION'"))' /tmp/result.json > /tmp/result.json.tmp
+              mv /tmp/result.json.tmp /tmp/result.json
+            fi
+          done
+          echo "Filtered matrix:"
+          cat /tmp/result.json
+          echo "matrix=$(jq -c . < /tmp/result.json)" >> $GITHUB_OUTPUT
 
   installation-and-connectivity:
     name: Installation and Connectivity Test