add support for building with nix and release with github actions

Author: iWisp360

.github/workflows/nix-android.yml

@@ -0,0 +1,38 @@
+name: Build APKs for Android using Nix
+
+on: 
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+      with:
+        fetch-depth: 0
+        submodules: 'recursive'
+
+    - uses: cachix/install-nix-action@v31
+
+    - name: Check Necessary environment variables presence
+      run: |
+        if [ -z "$LOCAL_PROPERTIES" ] || [ -z "$GOOGLE_SERVICES_JSON" ]; then
+          echo "You may want to add LOCAL_PROPERTIES and GOOGLE_SERVICES_JSON environment variables to your secrets"
+          exit 1
+        fi
+      env:
+        LOCAL_PROPERTIES: ${{ secrets.LOCAL_PROPERTIES }}
+        GOOGLE_SERVICES_JSON: ${{ secrets.GOOGLE_SERVICES_JSON }}
+
+    - name: Build Task
+      run: nix --experimental-features "nix-command flakes" run .#buildRelease
+      env:
+        LOCAL_PROPERTIES: ${{ secrets.LOCAL_PROPERTIES }}
+        GOOGLE_SERVICES_JSON: ${{ secrets.GOOGLE_SERVICES_JSON }}
+    
+    - name: Upload Release APKs
+      uses: actions/upload-artifact@v7
+      with:
+        name: Release APKs
+        path: app/build/outputs/apk/release/*.apk
+

flake.nix

@@ -15,15 +15,18 @@
       perSystem =
         { pkgs, system, ... }:
         let
+          actualBuildTools = "36.0.0";
           androidComposition =
             pkgs:
             (pkgs.androidenv.composeAndroidPackages {
               platformVersions = [
                 "35"
+                "36"
               ];
 
               buildToolsVersions = [
                 "35.0.0"
+                actualBuildTools
               ];
 
               cmakeVersions = [
@@ -70,6 +73,47 @@
             JAVA_HOME = "${pkgs.jdk21}";
             ANDROID_HOME = "${androidComposition pkgs}/libexec/android-sdk";
           };
+
+          apps = {
+            buildRelease = {
+              type = "app";
+              program = "${pkgs.writeShellScriptBin "buildRelease" ''
+                if [ -z "$LOCAL_PROPERTIES" ] || [ -z "$GOOGLE_SERVICES_JSON" ]; then
+                  echo "LOCAL_PROPERTIES and GOOGLE_SERVICES_JSON environment variables must be set"
+                  exit 1
+                fi
+
+                if ! ${pkgs.git}/bin/git submodule update --init --recursive; then
+                  echo "failed getting submodules"
+                fi
+
+                echo $LOCAL_PROPERTIES >local.properties
+                echo $GOOGLE_SERVICES_JSON >app/google-services.json
+
+                export ANDROID_HOME="${androidComposition pkgs}/libexec/android-sdk/"
+                export ANDROID_SDK_ROOT="${androidComposition pkgs}/libexec/android-sdk/"
+                export ANDROID_NDK_HOME="$ANDROID_HOME/ndk-bundle/"
+                export GRADLE_OPTS="-Dorg.gradle.project.android.aapt2FromMavenOverride=${androidComposition pkgs}/libexec/android-sdk/build-tools/${actualBuildTools}/aapt2"
+                export JAVA_HOME="${pkgs.jdk21}"
+
+                cd presentation/src/main/cpp/
+                if ! [ -d libvpx_build ]; then
+                  sed -e "s|#!/bin/bash|#!${pkgs.bash}/bin/bash|g" \
+                    -e "s|make clean|${pkgs.gnumake}/bin/make clean|g" \
+                    -e "s|make -j|${pkgs.gnumake}/bin/make -j|g" build.sh >new_build.sh
+                  chmod +x new_build.sh
+                  if ! ${pkgs.bash}/bin/bash new_build.sh; then
+                    echo "libvpx build failed"
+                    exit 1
+                  fi
+                  rm new_build.sh
+                fi 
+
+                cd ../../../..
+                ./gradlew assembleRelease
+              ''}/bin/buildRelease";
+            };
+          };
         };
     };
 }