Split E2E into default and full

Following the pattern from other repos, split the E2E test job into a
default job that runs a single default-only test always on PRs and a
full job that runs the full matrix when the ready-to-test label is
added.

Signed-off-by: Daniel Farrell <dfarrell@redhat.com>

.github/workflows/e2e-full.yml

@@ -0,0 +1,37 @@
+---
+name: End to End Full
+
+on:
+  pull_request:
+    types: [labeled, opened, synchronize, reopened]
+
+jobs:
+  e2e:
+    name: E2E
+    if: contains(github.event.pull_request.labels.*.name, 'ready-to-test')
+    timeout-minutes: 45
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        cable_driver: ['libreswan', 'wireguard', 'vxlan']
+        globalnet: ['', 'globalnet']
+        k8s_version: ['1.17']
+        lighthouse: ['', 'lighthouse']
+        include:
+          - k8s_version: '1.18'
+          - k8s_version: '1.19'
+          - k8s_version: '1.20'
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v2
+
+      - name: Run E2E deployment and tests
+        uses: submariner-io/shipyard/gh-actions/e2e@devel
+        with:
+          k8s_version: ${{ matrix.k8s_version }}
+          using: ${{ matrix.cable_driver }} ${{ matrix.globalnet }} ${{ matrix.lighthouse }}
+
+      - name: Post mortem
+        if: failure()
+        uses: submariner-io/shipyard/gh-actions/post-mortem@devel