Introduce 'Determine Hermes build flag' step

Author: fabriziocucci

.github/actions/build-android/action.yml

@@ -31,6 +31,23 @@ runs:
       if: ${{ !endsWith(github.ref_name, '-stable') && !endsWith(github.base_ref || '', '-stable') || endsWith(github.ref_name, '-stable') && steps.read-rn-version.outputs.rn-version == '1000.0.0' }}
       shell: bash
       run: node ./scripts/releases/set-rn-artifacts-version.js --build-type ${{ inputs.release-type }}
+    - name: Determine Hermes build flag
+      id: hermes-flag
+      shell: bash
+      run: |
+        if [[ "${{ inputs.release-type }}" == "dry-run" ]]; then
+          # Use stable Hermes on stable branches, nightly Hermes on main
+          if [[ "${{ github.ref_name }}" == *"-stable" ]] || [[ "${{ github.base_ref }}" == *"-stable" ]]; then
+            echo "ORG_GRADLE_PROJECT_react.internal.useHermesStable=true" >> $GITHUB_ENV
+          else
+            echo "ORG_GRADLE_PROJECT_react.internal.useHermesNightly=true" >> $GITHUB_ENV
+          fi
+        elif [[ "${{ inputs.release-type }}" == "nightly" ]]; then
+          echo "ORG_GRADLE_PROJECT_react.internal.useHermesNightly=true" >> $GITHUB_ENV
+        else
+          # release
+          echo "ORG_GRADLE_PROJECT_react.internal.useHermesStable=true" >> $GITHUB_ENV
+        fi
     - name: Setup gradle
       uses: ./.github/actions/setup-gradle
       with:
@@ -54,24 +71,16 @@ runs:
         if [[ "${{ inputs.release-type }}" == "dry-run" ]]; then
           # dry-run: we only build ARM64 to save time/resources. For release/nightlies the default is to build all archs.
           export ORG_GRADLE_PROJECT_reactNativeArchitectures="arm64-v8a,x86" # x86 is required for E2E testing
-          # Use stable Hermes on stable branches, nightly Hermes on main
-          if [[ "${{ github.ref_name }}" == *"-stable" ]] || [[ "${{ github.base_ref }}" == *"-stable" ]]; then
-            export HERMES_PREBUILT_FLAG="ORG_GRADLE_PROJECT_react.internal.useHermesStable=true"
-          else
-            export HERMES_PREBUILT_FLAG="ORG_GRADLE_PROJECT_react.internal.useHermesNightly=true"
-          fi
           TASKS="publishAllToMavenTempLocal build"
         elif [[ "${{ inputs.release-type }}" == "nightly" ]]; then
           # nightly: we set isSnapshot to true so artifacts are sent to the right repository on Maven Central.
           export ORG_GRADLE_PROJECT_isSnapshot="true"
-          export HERMES_PREBUILT_FLAG="ORG_GRADLE_PROJECT_react.internal.useHermesNightly=true"
           TASKS="publishAllToMavenTempLocal publishAndroidToSonatype build"
         else
           # release: we want to build all archs (default)
-          export HERMES_PREBUILT_FLAG="ORG_GRADLE_PROJECT_react.internal.useHermesStable=true"
           TASKS="publishAllToMavenTempLocal publishAndroidToSonatype build"
         fi
-        env "$HERMES_PREBUILT_FLAG" ./gradlew $TASKS -PenableWarningsAsErrors=true
+        ./gradlew $TASKS -PenableWarningsAsErrors=true
     - name: Save Android ccache
       if: ${{ github.ref == 'refs/heads/main' || contains(github.ref, '-stable') }}
       uses: actions/cache/save@v5