github: only run Actions when Go files are changed (#6275)

.github/workflows/go.yml

@@ -3,6 +3,8 @@ on:
   push:
     branches: [master]
   pull_request:
+    paths:
+      - '**.go'
 env:
   GOPROXY: "https://proxy.golang.org"
 

.github/workflows/lsif.yml

@@ -1,5 +1,8 @@
 name: LSIF
-on: [push]
+on:
+  push:
+    paths:
+      - '**.go'
 jobs:
   lsif-go:
     if: github.repository == 'gogs/gogs'