Change process check cause kill -0 seems not to work on alpine for so…

…me reason

src/containers/server/loadRunningInstance.ts

@@ -11,8 +11,10 @@ export async function loadRunningInstance() {
       const json = JSON.parse(content);
       if (json.pid > 0) {
         try {
-          // sending the signal 0 to a given PID just checks if any process with the given PID is running, and you have the permission to send a signal to it.
-          process.kill(json.pid, 0);
+          // kill -0 seems not to work on alpine for some reason
+          if (!fs.existsSync('/proc/' + json.pid)) {
+            return null;
+          }
         } catch (err) {
           return null;
         }