.github/workflows: add cross-android

Fixes 4482

Signed-off-by: James Tucker <james@tailscale.com>

.github/workflows/cross-android.yml

@@ -31,11 +31,11 @@ jobs:
         GOARCH: amd64
       run: go build ./cmd/...
 
-    - name: Android build tests
+    - name: Android build tests (does not run tests)
       env:
         GOOS: android
         GOARCH: amd64
-      run: for d in $(go list -f '{{if .TestGoFiles}}{{.Dir}}{{end}}' ./... ); do (echo $d; cd $d && go test -c ); done
+      run: for d in $(go list -f '{{if .TestGoFiles}}{{.Dir}}{{end}}' ./... ); do (echo $d; cd $d && go test -run '^$' -c ); done
 
     - uses: k0kubun/action-slack@v2.0.0
       with:

wgengine/monitor/monitor_linux_test.go

@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !android
+// +build !android
+
 package monitor
 
 import (