ci: add path filters to Go build and include self-trigger for both workflows

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/android-build.yml

@@ -3,9 +3,13 @@ name: Android Build
 on:
   push:
     branches: ["main"]
-    paths: ["android/**"]
+    paths:
+      - "android/**"
+      - ".github/workflows/android-build.yml"
   pull_request:
-    paths: ["android/**"]
+    paths:
+      - "android/**"
+      - ".github/workflows/android-build.yml"
   workflow_dispatch:
 
 jobs:

.github/workflows/build.yml

@@ -3,6 +3,21 @@ name: build
 on:
   push:
     branches: ["main"]
+    paths:
+      - "cmd/**"
+      - "pkg/**"
+      - "go.mod"
+      - "go.sum"
+      - "Makefile"
+      - ".github/workflows/build.yml"
+  pull_request:
+    paths:
+      - "cmd/**"
+      - "pkg/**"
+      - "go.mod"
+      - "go.sum"
+      - "Makefile"
+      - ".github/workflows/build.yml"
 
 jobs:
   build: