ci: add fork-only pull_request workflow for pre-submit signal

Signed-off-by: Chris Randles <randles.chris@gmail.com>

Author: crandles

.github/workflows/fork-ci.yml

@@ -0,0 +1,55 @@
+name: fork-ci
+
+# Runs verify + unit tests on forks only. Upstream CI lives in Prow;
+# this gives contributors deterministic pre-review signal on their branch.
+# The job is gated to forks so it stays dormant in kubernetes-sigs/e2e-framework.
+#
+# Intended flow: open an intra-fork PR (feature-branch -> main on your fork)
+# to get pre-submit signal, then open the upstream PR once it's green.
+# Cross-fork PRs (fork -> kubernetes-sigs/e2e-framework) fire pull_request
+# events in the upstream repo's context, where the repository guard skips
+# this workflow by design.
+
+on:
+  pull_request:
+
+permissions: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  verify:
+    if: github.repository != 'kubernetes-sigs/e2e-framework'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Set up Go
+        uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
+        with:
+          go-version: '1.26'
+          check-latest: 'true'
+          cache: 'true'
+
+      - name: Verify
+        run: make verify
+
+  test:
+    if: github.repository != 'kubernetes-sigs/e2e-framework'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Set up Go
+        uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
+        with:
+          go-version: '1.26'
+          check-latest: 'true'
+          cache: 'true'
+
+      - name: Test
+        run: make test