ci: run e2e tests against all active K8s versions

Retrieve the active k8s version and build a test matrix.

Fixes: #48

Generated-by: AI
Signed-off-by: Alice Frosi <afrosi@redhat.com>

Author: alicefr

.github/workflows/ci.yaml

@@ -17,6 +17,18 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  supported-versions:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - name: Get supported Kubernetes versions
+        id: set-matrix
+        run: |
+          MATRIX=$(curl -s https://endoflife.date/api/kubernetes.json | \
+            jq -c '[.[] | select(.eol > (now | strftime("%Y-%m-%d"))) | .cycle][:3]')
+          echo "matrix=${MATRIX}" >> "$GITHUB_OUTPUT"
+
   unit:
     runs-on: ubuntu-latest
     permissions:
@@ -85,13 +97,19 @@ jobs:
 
   e2e:
     runs-on: ubuntu-latest
-    needs: build-bink
+    needs: [build-bink, supported-versions]
     timeout-minutes: 30
     permissions:
       contents: read
       packages: write
+    strategy:
+      # Run all versions even if one fails to identify version-specific issues.
+      fail-fast: false
+      matrix:
+        kube-minor: ${{ fromJson(needs.supported-versions.outputs.matrix) }}
     env:
       IMAGE: ghcr.io/${{ github.repository }}
+      BINK_NODE_DISK_IMAGE: ghcr.io/bootc-dev/bink/node:v${{ matrix.kube-minor }}-fedora-44-disk
     steps:
       - name: Checkout
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -138,6 +156,10 @@ jobs:
       - name: Start podman socket
         run: systemctl --user start podman.socket
 
+      - name: Get default K8s version
+        id: defaults
+        run: echo "kube-minor=$(make -s print-var-DEFAULT_KUBE_MINOR)" >> "$GITHUB_OUTPUT"
+
       - name: Build operator image
         run: make buildimg
 
@@ -158,12 +180,12 @@ jobs:
         if: always()
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
-          name: e2e-logs
+          name: e2e-logs-${{ matrix.kube-minor }}
           path: _output/logs/
           if-no-files-found: ignore
 
       - name: Push to GHCR
-        if: github.event_name == 'push'
+        if: github.event_name == 'push' && matrix.kube-minor == steps.defaults.outputs.kube-minor
         env:
           ACTOR: ${{ github.actor }}
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}