Enhance pull request workflow with code change detection

Updated pull request workflow to include code change detection and conditional builds for Android, iOS, and screenshot jobs.

Author: rahul31124

.github/workflows/pull-request.yml

@@ -3,17 +3,7 @@ name: Build
 on:
   pull_request:
     branches: ["flutter"]
-    paths-ignore:
-      - '**.md'
-      - 'docs/**'
-      - '**.png'
-      - '**.jpg'
-      - '**.jpeg'
-      - '**.gif'
-      - '**.svg'
-      - '**.webp'
-      - '**.txt'
-      - '**.arb'
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -25,6 +15,28 @@ env:
   IPAD_DEVICE_MODEL: iPad Pro 13-inch (M4)
 
 jobs:
+
+  changes:
+    name: Detect Code Changes
+    runs-on: ubuntu-latest
+    outputs:
+      code: ${{ steps.filter.outputs.code }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - id: filter
+        uses: dorny/paths-filter@v3
+        with:
+          filters: |
+            code:
+              - '**.dart'
+              - 'android/**'
+              - 'ios/**'
+              - 'lib/**'
+              - 'linux/**'
+              - 'windows/**'
+              - 'macos/**'
+
   common:
     name: Common Build
     runs-on: ubuntu-latest
@@ -46,31 +58,43 @@ jobs:
 
   android:
     name: Android Flutter Build
-    needs: common
+    needs: [common, changes]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
 
+      - name: Skip Android build for docs
+        if: needs.changes.outputs.code != 'true'
+        run: echo "non-code changes"
+
       - name: Android Workflow
+        if: needs.changes.outputs.code == 'true'
         uses: ./.github/actions/android
 
   ios:
     name: iOS Flutter Build
-    needs: common
+    needs: [common, changes]
     runs-on: macos-latest
     steps:
       - name: Set up Xcode
         uses: maxim-lobanov/setup-xcode@v1.7.0
         with:
           xcode-version: '16.4.0'
-          
+
       - uses: actions/checkout@v6
 
+      - name: Skip iOS build for docs
+        if: needs.changes.outputs.code != 'true'
+        run: echo "non-code changes"
+
       - name: iOS Workflow
+        if: needs.changes.outputs.code == 'true'
         uses: ./.github/actions/ios
 
   screenshots-android:
     name: Screenshots (Android)
+    needs: [changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
@@ -84,6 +108,8 @@ jobs:
 
   screenshots-iphone:
     name: Screenshots (iPhone)
+    needs: [changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: macos-latest
     timeout-minutes: 30
     steps:
@@ -98,9 +124,11 @@ jobs:
         uses: ./.github/actions/screenshot-iphone
         with:
           IPHONE_DEVICE_MODEL: ${{ env.IPHONE_DEVICE_MODEL }}
-  
+
   screenshots-ipad:
     name: Screenshots (iPad)
+    needs: [changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: macos-latest
     timeout-minutes: 30
     steps:
@@ -115,20 +143,22 @@ jobs:
         uses: ./.github/actions/screenshot-ipad
         with:
           IPAD_DEVICE_MODEL: ${{ env.IPAD_DEVICE_MODEL }}
-  
+
   windows:
     name: Windows Flutter Build
-    needs: common
+    needs: [common, changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v6
 
       - name: Windows Workflow
         uses: ./.github/actions/windows
-  
+
   linux:
     name: Linux Flutter Build
-    needs: common
+    needs: [common, changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
@@ -138,7 +168,8 @@ jobs:
 
   linux-arm64:
     name: Linux ARM64 Flutter Build
-    needs: common
+    needs: [common, changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@v6
@@ -148,7 +179,8 @@ jobs:
 
   macos:
     name: macOS Flutter Build
-    needs: common
+    needs: [common, changes]
+    if: needs.changes.outputs.code == 'true'
     runs-on: macos-latest
     steps:
       - name: Set up Xcode
@@ -159,4 +191,4 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: macOS Workflow
-        uses: ./.github/actions/macos
+        uses: ./.github/actions/macos