ci: distribute the compiled integration test binary

.github/workflows/test-integration.yaml

@@ -46,14 +46,14 @@ jobs:
         if: steps.changed-files.outputs.files == 'true'
       - uses: Mic92/hestia@dfed9ced335d28978ba74e513939a10db1f71025 # v3.1.0
         if: steps.changed-files.outputs.files == 'true'
-      - name: Build binaries and warm Go cache
+      - name: Build binaries
         if: steps.changed-files.outputs.files == 'true'
         run: |
-          # Build all Go binaries in one nix shell to maximize cache reuse
+          # Build once for the native worker architecture. Static binaries
+          # also run in the minimal Headscale image without a Go toolchain.
           go build -o hi ./cmd/hi
           CGO_ENABLED=0 GOOS=linux go build -o headscale ./cmd/headscale
-          # Build integration test binary to warm the cache with all dependencies
-          go test -c ./integration -o /dev/null 2>/dev/null || true
+          CGO_ENABLED=0 GOOS=linux go test -c ./integration -o integration.test
       - name: Upload hi binary
         if: steps.changed-files.outputs.files == 'true'
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
@@ -61,17 +61,12 @@ jobs:
           name: hi-binary
           path: hi
           retention-days: 10
-      - name: Package Go cache
-        if: steps.changed-files.outputs.files == 'true'
-        run: |
-          # Package Go module cache and build cache
-          tar -czf go-cache.tar.gz -C ~ go .cache/go-build
-      - name: Upload Go cache
+      - name: Upload integration test binary
         if: steps.changed-files.outputs.files == 'true'
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
-          name: go-cache
-          path: go-cache.tar.gz
+          name: integration-test-binary
+          path: integration.test
           retention-days: 10
       - name: Force overlay2 storage driver
         if: steps.changed-files.outputs.files == 'true'