Android: Clean build folder at some intermediate steps to reduce disk usage

With debug symbols, the full Android build can take around 100G currently.

build-android/build.sh

@@ -11,11 +11,14 @@ export OPTIONS="production=yes debug_symbols=yes"
 export OPTIONS_MONO="module_mono_enabled=yes"
 export TERM=xterm
 
-rm -rf godot
-mkdir godot
-cd godot
-tar xf /root/godot.tar.gz --strip-components=1
-cp -rf /root/swappy/* thirdparty/swappy-frame-pacing/
+prepare_source() {
+  cd /root
+  rm -rf godot
+  mkdir godot
+  cd godot
+  tar xf /root/godot.tar.gz --strip-components=1
+  cp -rf /root/swappy/* thirdparty/swappy-frame-pacing/
+}
 
 # Environment variables and keystore needed for signing store editor build,
 # as well as signing and publishing to MavenCentral.
@@ -32,6 +35,8 @@ fi
 if [ "${CLASSICAL}" == "1" ]; then
   echo "Starting classical build for Android..."
 
+  prepare_source
+
   $SCONS platform=android arch=arm32 $OPTIONS target=editor store_release=${store_release}
   $SCONS platform=android arch=arm64 $OPTIONS target=editor store_release=${store_release}
   $SCONS platform=android arch=x86_32 $OPTIONS target=editor store_release=${store_release}
@@ -47,6 +52,7 @@ if [ "${CLASSICAL}" == "1" ]; then
   popd
 
   mkdir -p /root/out/tools
+
   # Copy the generated Android editor binaries (apk & aab).
   if [ "$store_release" == "yes" ]; then
     cp bin/android_editor_builds/android-editor-android-release-native-debug-symbols.zip /root/out/tools/android_editor_native_debug_symbols.zip
@@ -74,6 +80,8 @@ if [ "${CLASSICAL}" == "1" ]; then
 
   # Template builds
 
+  prepare_source
+
   $SCONS platform=android arch=arm32 $OPTIONS target=template_debug
   $SCONS platform=android arch=arm32 $OPTIONS target=template_release
 
@@ -112,6 +120,8 @@ fi
 if [ "${MONO}" == "1" ]; then
   echo "Starting Mono build for Android..."
 
+  prepare_source
+
   cp -r /root/mono-glue/GodotSharp/GodotSharp/Generated modules/mono/glue/GodotSharp/GodotSharp/
 
   $SCONS platform=android arch=arm32 $OPTIONS $OPTIONS_MONO target=template_debug

build.sh

@@ -278,3 +278,5 @@ if [ ! -z "$SUDO_UID" ]; then
   gid="${SUDO_GID}"
 fi
 chown -R -f $uid:$gid ${basedir}/git ${basedir}/out ${basedir}/mono-glue ${basedir}/godot*.tar.gz
+
+echo "All builds completed. Check `out/logs/` to validate that they all succeeded (e.g. `tail -n 1 out/logs/*`)."