Fix CI release builds

android/containerized_build.sh

@@ -9,6 +9,10 @@ docker build --build-arg BUILD_UID=`id -u` -t "${DOCKER_IMAGE_NAME}" -f docker/D
 # So make sure we use VERSION_CODE consistently
 test -z "$VERSION_CODE" && export VERSION_CODE=$VERSION
 
+# PR builds don't populate STABLE_BUILD, but the release builds do, and the build
+# bash script requires it, so we need to populate it if it's not present
+test -z "$STABLE_BUILD" && export STABLE_BUILD=0
+
 # FIXME figure out which of these actually need to be forwarded and which can be eliminated
 docker run \
    --rm \
@@ -29,6 +33,7 @@ docker run \
    -e OAUTH_CLIENT_ID \
    -e OAUTH_REDIRECT_URI \
    -e SHA7 \
+   -e STABLE_BUILD \
    -e VERSION_CODE \
    "${DOCKER_IMAGE_NAME}" \
    sh -c "./build_android.sh"