ci: removing legacy integration tests

The legacy integration tests required an outdated host (ubuntu 18.04) to be run on. Those hosts were removed on the 01.12.2022, thus the integration tests can no longer be run. Removing them.

.github/workflows/.reusable-integration-test.yml

@@ -133,45 +133,3 @@ jobs:
         if: failure()
         run: |
           kubectl logs -n connaisseur -lapp.kubernetes.io/name=connaisseur --prefix=true
-
-  k8s-legacy-versions:
-    # k3s with older versions doesn't play with newer kernel, so we're running those on deprecated hosts, yay...
-    runs-on: ubuntu-18.04
-    if: inputs.skip_integration_tests != 'non-required'
-    permissions:
-      packages: read
-    env:
-      IMAGE: ${{ inputs.build_image }}
-      COSIGN_PUBLIC_KEY: ${{ inputs.cosign_public_key }}
-    strategy:
-      fail-fast: false
-      matrix:
-        k8s-version: [
-            "v1.16",
-            "v1.17",
-            "v1.18",
-            "v1.19",
-          ]
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
-      - name: Login with registry
-        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # v2.1.0
-        with:
-          registry: ${{ inputs.build_registry }}
-          username: ${{ inputs.repo_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Install yq
-        run: |
-          sudo snap install yq
-      - uses: ./.github/actions/k8s-version-config
-        name: Setup k8s cluster
-        with:
-          k8s-version: ${{ matrix.k8s-version }}
-      - name: Run pre-config and workload integration tests
-        run: |
-          bash tests/integration/integration-test.sh "pre-and-workload"
-      - name: Display k8s logs if integration test failed
-        if: failure()
-        run: |
-          kubectl logs -n connaisseur -lapp.kubernetes.io/name=connaisseur --prefix=true