Add snap configure hook to allow enable debug mode

scripts/container-manager.sh

@@ -43,6 +43,10 @@ start() {
 		$SNAP/sbin/apparmor_parser -r $SNAP/apparmor/anbox-container.aa
 	fi
 
+	if [ -e "$SNAP_COMMON"/.enable_debug ]; then
+		export ANBOX_LOG_LEVEL=debug
+	fi
+
 	exec $AA_EXEC $SNAP/bin/anbox-wrapper.sh container-manager \
 		--data-path=$DATA_PATH \
 		--android-image=$ANDROID_IMG \

scripts/snap-wrapper.sh

@@ -29,4 +29,8 @@ export XDG_DATA_HOME="$SNAP_USER_COMMON/app-data"
 # configured but the actual EGL implementation is missing.
 export __EGL_VENDOR_LIBRARY_DIRS="$SNAP/glvnd"
 
+if [ -e "$SNAP_COMMON"/.enable_debug ]; then
+	export ANBOX_LOG_LEVEL=debug
+fi
+
 exec $SNAP/usr/bin/anbox $@