CI: add Android build systems

.ci/scripts/android/build.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -ex
+
+export NDK_CCACHE="$(which ccache)"
+ccache -s
+
+BUILD_FLAVOR=mainline
+
+cd src/android
+chmod +x ./gradlew
+./gradlew "assemble${BUILD_FLAVOR}Release" "bundle${BUILD_FLAVOR}Release"
+
+ccache -s

.ci/scripts/android/upload.sh

@@ -0,0 +1,24 @@
+#!/bin/bash -ex
+
+. ./.ci/scripts/common/pre-upload.sh
+
+REV_NAME="yuzu-${GITDATE}-${GITREV}"
+
+BUILD_FLAVOR=mainline
+
+cp src/android/app/build/outputs/apk/"${BUILD_FLAVOR}/release/app-${BUILD_FLAVOR}-release.apk" \
+  "artifacts/${REV_NAME}.apk"
+cp src/android/app/build/outputs/bundle/"${BUILD_FLAVOR}Release"/"app-${BUILD_FLAVOR}-release.aab" \
+  "artifacts/${REV_NAME}.aab"
+
+if [ -n "${ANDROID_KEYSTORE_B64}" ]
+then
+  echo "Signing apk..."
+  base64 --decode <<< "${ANDROID_KEYSTORE_B64}" > ks.jks
+
+  apksigner sign --ks ks.jks \
+    --ks-key-alias "${ANDROID_KEY_ALIAS}" \
+    --ks-pass env:ANDROID_KEYSTORE_PASS "artifacts/${REV_NAME}.apk"
+else
+  echo "No keystore specified, not signing the APK files."
+fi