Use content hash for react-native builds (facebook#26734)

.github/workflows/commit_artifacts.yml

@@ -228,7 +228,16 @@ jobs:
           name: compiled-rn
           path: compiled-rn/
       - run: git status -u
+      - name: Check if only the REVISION file has changed
+        id: check_should_commit
+        run: |
+          if git status --porcelain | grep -qv '/REVISION$'; then
+            echo "should_commit=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "should_commit=false" >> "$GITHUB_OUTPUT"
+          fi
       - name: Commit changes to branch
+        if: steps.check_should_commit.outputs.should_commit == 'true'
         uses: stefanzweifel/git-auto-commit-action@v4
         with:
           commit_message: |

scripts/rollup/build-all-release-channels.js

@@ -177,6 +177,26 @@ function processStable(buildDir) {
     );
   }
 
+  const reactNativeBuildDir = buildDir + '/react-native/implementations/';
+  if (fs.existsSync(reactNativeBuildDir)) {
+    const hash = crypto.createHash('sha1');
+    for (const fileName of fs.readdirSync(reactNativeBuildDir).sort()) {
+      const filePath = reactNativeBuildDir + fileName;
+      const stats = fs.statSync(filePath);
+      if (!stats.isDirectory()) {
+        hash.update(fs.readFileSync(filePath));
+      }
+    }
+    updatePlaceholderReactVersionInCompiledArtifacts(
+      reactNativeBuildDir,
+      ReactVersion +
+        '-' +
+        nextChannelLabel +
+        '-' +
+        hash.digest('hex').slice(0, 8)
+    );
+  }
+
   // Update remaining placeholders with next channel version
   updatePlaceholderReactVersionInCompiledArtifacts(
     buildDir,