.github: rebuild ginkgo tests in case of cache miss

Same as cilium#26263, but for conformance-runtime test.

Signed-off-by: Tam Mach <tam.mach@cilium.io>

.github/workflows/conformance-runtime.yaml

@@ -88,6 +88,9 @@ jobs:
       - name: Set Environment Variables
         uses: ./.github/actions/set-env-variables
 
+      # If any of these steps are modified, please update the copy of these
+      # steps further down under the 'setup-and-test' jobs.
+
       # Load Ginkgo build from GitHub
       - name: Load ginkgo runtime from GH cache
         uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
@@ -250,6 +253,39 @@ jobs:
           path: /tmp/.ginkgo-build/
           key: ${{ runner.os }}-ginkgo-runtime-${{ hashFiles('**/*.go') }}
 
+      - name: Install Go
+        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+        uses: actions/setup-go@fac708d6674e30b6ba41289acaab6d4b75aa0753 # v4.0.1
+        with:
+          # renovate: datasource=golang-version depName=go
+          go-version: 1.20.6
+
+      - name: Build Ginkgo
+        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+        shell: bash
+        run: |
+          go install github.com/onsi/ginkgo/ginkgo@v1.16.5
+          mkdir -p /tmp/.ginkgo-build
+
+      - name: Build Test
+        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+        shell: bash
+        run: |
+          cd test
+          /home/runner/go/bin/ginkgo build
+          strip test.test
+          tar -cz test.test -f test.tgz
+
+      - name: Store Ginkgo Test in GitHub cache path
+        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
+        shell: bash
+        run: |
+          mkdir -p /tmp/.ginkgo-build/
+          if [ -f test/test.tgz ]; then
+            cp test/test.tgz /tmp/.ginkgo-build/
+            echo "file copied"
+          fi
+
       - name: Copy Ginkgo binary
         shell: bash
         run: |