android-test: gate order stable-self then published; FAIL_FAST default

Matrix runs release self-build before F-Droid APK, then master. First
failure stops. Emulator cold-boots without snapshots by default.

scripts/taler-monitoring/android-test/lib_android_env.sh

@@ -68,8 +68,9 @@ export EMULATOR_GPU
 : "${EMULATOR_CORES:=2}"
 # If no adb device: start headless AVD (0 = require phone/manual emulator)
 : "${AUTO_START_EMULATOR:=1}"
-: "${EMULATOR_BOOT_TIMEOUT:=180}"
+: "${EMULATOR_BOOT_TIMEOUT:=360}"
 : "${EMULATOR_LOG:=/tmp/taler-android-emulator.log}"
+: "${EMULATOR_NO_SNAPSHOT:=1}"
 
 android_adb_serial() {
   adb devices 2>/dev/null | awk '/\tdevice$/{print $1; exit}'
@@ -89,6 +90,10 @@ android_emulator_args() {
     # Avoid Qt trying to open a display on servers
     export QT_QPA_PLATFORM="${QT_QPA_PLATFORM:-offscreen}"
   fi
+  # Broken default_boot snapshots leave adb offline forever — cold boot by default.
+  if [ "${EMULATOR_NO_SNAPSHOT:-1}" = "1" ]; then
+    args+=( -no-snapshot -no-snapshot-load -no-snapshot-save )
+  fi
   if [ -n "${EMULATOR_MEMORY:-}" ]; then
     args+=( -memory "$EMULATOR_MEMORY" )
   fi