Cloud Build custom docker image

Dockerfile

@@ -0,0 +1,16 @@
+FROM debian:latest
+
+# Installing Java (and curl)
+RUN apt-get update && apt-get install -y curl default-jre default-jdk
+RUN apt-get install -y build-essential
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.0/install.sh | bash
+RUN nvm install .
+RUN nvm use .
+
+RUN npm install -g yarn firebase-tools
+
+RUN firebase setup:emulators:firestore
+
+COPY . /
+
+CMD yarn

cloudbuild.yaml

@@ -4,15 +4,21 @@
 #   @next   `gcloud builds submit --substitutions=TAG_NAME="v1.2.3-rc.1"`
 #   @latest `gcloud builds submit --substitutions=TAG_NAME="v1.2.3"`
 steps:
-- name: 'gcr.io/cloud-builders/yarn'
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['pull', 'gcr.io/reactfire/docker']
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['build', '-t', 'gcr.io/reactfire/docker', '--cache-from', 'gcr.io/reactfire/docker']
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['push', 'gcr.io/reactfire/firebase']
+- name: 'gcr.io/reactfire/docker'
   args: ['install', '--frozen-lockfile']
-- name: 'gcr.io/cloud-builders/yarn'
+- name: 'gcr.io/reactfire/docker'
   dir: 'reactfire'
   args: ['build']
-- name: 'gcr.io/cloud-builders/yarn'
+- name: 'gcr.io/reactfire/docker'
   dir: 'reactfire'
   args: ['test']
-- name: 'gcr.io/cloud-builders/npm'
+- name: 'gcr.io/reactfire/docker'
   dir: 'reactfire/pub/reactfire'
   entrypoint: 'bash'
   env:
@@ -24,4 +30,7 @@ steps:
 secrets:
 - kmsKeyName: projects/reactfire/locations/global/keyRings/cloud-build/cryptoKeys/cloud-build
   secretEnv:
-    NPM_TOKEN: CiQADamFn5XzbeNQgzTGST9r3Tp5skWlDbBiWaZljffgEm0yIxYSTQC1QbtmDtScXx1BPE+d3CP9rXvOY+n5J0XRuLTTqN7RaqyipCEqTi7+z1kI6mKyBo2ilsMtOtngNzbOZ8kZeUDA80ISLWrNs0hF8k78
+    NPM_TOKEN: CiQADamFn5XzbeNQgzTGST9r3Tp5skWlDbBiWaZljffgEm0yIxYSTQC1QbtmDtScXx1BPE+d3CP9rXvOY+n5J0XRuLTTqN7RaqyipCEqTi7+z1kI6mKyBo2ilsMtOtngNzbOZ8kZeUDA80ISLWrNs0hF8k78
+
+images:
+- gcr.io/reactfire/docker