fix: use taskkill to kill stuck coverage process on windows

src/test/node.js

@@ -1,3 +1,4 @@
+import os from 'os'
 import path from 'path'
 import { fileURLToPath } from 'url'
 import { execa } from 'execa'
@@ -115,9 +116,18 @@ export default async function testNode (argv, execaOptions) {
           console.warn(kleur.red('!!! Collecting coverage has hung, killing process')) // eslint-disable-line no-console
           console.warn(kleur.red('!!! See https://github.com/ipfs/aegir/issues/1206 for more information')) // eslint-disable-line no-console
           killedWhileCollectingCoverage = true
-          proc.kill('SIGTERM', {
-            forceKillAfterTimeout: 1000
-          })
+
+          if (os.platform() === 'win32') {
+            // SIGTERM/SIGKILL doesn't work reliably on windows
+            execa('taskkill', ['/F', '/pid', `${proc.pid}`])
+              .catch(err => {
+                console.error('Could not kill process with PID', proc.pid, err) // eslint-disable-line no-console
+              })
+          } else {
+            proc.kill('SIGTERM', {
+              forceKillAfterTimeout: 1000
+            })
+          }
         }, argv.covTimeout).unref()
       }
     })