only trigger docs build and publish when docs changed (#22968)

Since drone plugin
https://github.com/meltwater/drone-convert-pathschanged/ enabled, we can
filter event with path in drone.

Building docs will now only be triggered when documentations changed.

---------

Co-authored-by: Jason Song <i@wolfogre.com>

Author: lunny

.drone.yml

@@ -12,6 +12,9 @@ trigger:
     - push
     - tag
     - pull_request
+  paths:
+    exclude:
+      - docs/**
 
 volumes:
   - name: deps
@@ -112,7 +115,6 @@ steps:
     image: golang:1.19 # this step is kept as the lowest version of golang that we support
     pull: always
     environment:
-      GO111MODULE: on
       GOPROXY: https://goproxy.io
     commands:
       - go build -o gitea_no_gcc # test if build succeeds without the sqlite tag
@@ -124,7 +126,6 @@ steps:
   - name: build-backend-arm64
     image: golang:1.20
     environment:
-      GO111MODULE: on
       GOPROXY: https://goproxy.io
       GOOS: linux
       GOARCH: arm64
@@ -140,7 +141,6 @@ steps:
   - name: build-backend-windows
     image: golang:1.20
     environment:
-      GO111MODULE: on
       GOPROXY: https://goproxy.io
       GOOS: windows
       GOARCH: amd64
@@ -155,7 +155,6 @@ steps:
   - name: build-backend-386
     image: golang:1.20
     environment:
-      GO111MODULE: on
       GOPROXY: https://goproxy.io
       GOOS: linux
       GOARCH: 386
@@ -183,6 +182,9 @@ trigger:
     - push
     - tag
     - pull_request
+  paths:
+    exclude:
+      - docs/**
 
 volumes:
   - name: deps
@@ -410,6 +412,9 @@ trigger:
     - push
     - tag
     - pull_request
+  paths:
+    exclude:
+      - docs/**
 
 volumes:
   - name: deps
@@ -517,6 +522,9 @@ depends_on:
 trigger:
   event:
     - pull_request
+  paths:
+    exclude:
+      - docs/**
 
 volumes:
   - name: deps
@@ -696,6 +704,9 @@ trigger:
     - "release/*"
   event:
     - push
+  paths:
+    exclude:
+      - docs/**
 
 depends_on:
   - testing-amd64
@@ -947,6 +958,9 @@ trigger:
     - push
     - tag
     - pull_request
+  paths:
+    include:
+      - docs/**
 
 steps:
   - name: build-docs
@@ -1241,6 +1255,9 @@ depends_on:
 trigger:
   ref:
   - "refs/pull/**"
+  paths:
+    exclude:
+      - docs/**
 
 steps:
   - name: dryrun