add custom dockerfile

.dockerignore

@@ -0,0 +1,22 @@
+# Copyright 2015 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+node_modules
+.dockerignore
+Dockerfile
+npm-debug.log
+yarn-error.log
+.git
+.hg
+.svn

Dockerfile

@@ -0,0 +1,14 @@
+# Dockerfile extending the generic Node image with application files for a
+# single application.
+FROM gcr.io/google_appengine/nodejs
+
+RUN apt-get update -y && apt-get install -y -q imagemagick graphicsmagick
+
+RUN npm install --unsafe-perm --global yarn
+COPY . /app/
+
+RUN yarn install --production || \
+  ((if [ -f yarn-error.log ]; then \
+      cat yarn-error.log; \
+    fi) && false)
+CMD yarn start

app.yaml

@@ -1,2 +1,2 @@
-env: flex
 runtime: custom
+env: flex