Rely on AGP to auto-install CMake and the NDK.

.ci_tools/setup_env.sh

@@ -1,18 +1,8 @@
 #!/bin/bash
 
-# Installs Android SDK, NDK, and CMake required to build the samples.
+# Detects which Android SDK versions are used by the samples and installs those.
+# NDK and CMake are auto-installed by AGP as needed.
 
 if [ -f ~/.android/repositories.cfg ]; then
   touch ~/.android/repositories.cfg
 fi
-
-for version in $(find . -name build.gradle | xargs grep -h compileSdk | sort | uniq | grep -o '[0-9]\+ *$'); do
-    echo y | sdkmanager "platforms;android-${version}"
-done
-
-for version in $(find . -name build.gradle | xargs grep -h ndkVersion | sort | uniq | cut -d \' -f 2); do
-    echo y | sdkmanager "ndk;${version}"
-done
-
-echo y | sdkmanager "cmake;3.18.1"
-echo y | sdkmanager "cmake;3.22.1"