setup-go cache path, remove go in base image, gomobile

.github/workflows/build.yml

@@ -33,11 +33,15 @@ jobs:
     - uses: actions/setup-go@v5
       with:
         go-version: '1.21'
+        cache-dependency-path: rdk/go.sum
+    - name: gomobile
+      run: |
+        # todo: pin version in go.mod
+        go install golang.org/x/mobile/cmd/gomobile@latest
+        gomobile init
     - name: build AAR
       working-directory: rdk
-      run: |
-        which go
-        CGO_CFLAGS="-I $HOME/tensorflow/tensorflow-2.12.0" PLATFORM_NDK_ROOT=$NDK_ROOT NDK_ROOT=$NDK_ROOT make droid-rdk.aar
+      run: CGO_CFLAGS="-I $HOME/tensorflow/tensorflow-2.12.0" PLATFORM_NDK_ROOT=$NDK_ROOT NDK_ROOT=$NDK_ROOT make droid-rdk.aar
     # todo: pass down APK + RDK version information
     - name: build APK
       working-directory: rdk-apk
@@ -47,7 +51,12 @@ jobs:
         source $SDKMAN_DIR/bin/sdkman-init.sh
         # todo(review): is it safe to use gradle in path instead of gradlew? or way to make gradlew use system gradle?
         gradle --no-daemon assembleDebug
+    - name: rename
+      run: |
+        mkdir dist
+        mv rdk-apk/app/build/outputs/apk/debug/app-debug.apk \
+          dist/rdk-$(date +%y%m%d)-$(cd rdk && git rev-parse --short HEAD)-$(cd rdk-apk && git rev-parse --short HEAD).apk
     - uses: actions/upload-artifact@v4
       with:
-        path: rdk-apk/app/build/outputs/apk/debug/app-debug.apk
+        path: dist
         if-no-files-found: error

Dockerfile

@@ -4,13 +4,11 @@ FROM ubuntu:latest
 RUN --mount=type=cache,target=/var/cache/apt apt-get update
 # make...python3 for tflite build
 # nasm for x264
-# golang for rdk
 RUN --mount=type=cache,target=/var/cache/apt apt-get install -qy \
     zip \
     openjdk-21-jdk-headless \
     make curl patch cmake git python3 \
-    nasm \
-    golang-1.21-go
+    nasm
 
 ENV ANDROID_HOME /droid
 ENV ANDROID_SDK_ROOT /droid
@@ -32,9 +30,6 @@ RUN yes | sdkmanager --sdk_root=$(realpath .) --install "platforms;android-28" "
     && rm -rf tools/lib/monitor* \
     && rm -rf ${NDK_ROOT}/toolchains/llvm/prebuilt/linux-x86_64/musl
 
-ENV PATH ${PATH}:/usr/lib/go-1.21/bin:/root/go/bin
-RUN go install golang.org/x/mobile/cmd/gomobile@latest && gomobile init
-
 ENV SDKMAN_DIR /usr/local/sdkman
 # this is the sdk manager script from https://get.sdkman.io/
 # we have a copy checked-in to get a consistent version